deps(python): update cloud-sql-python-connector[asyncpg,pg8000] requirement from >=1.18.0 to >=1.20.1 (#5284)

Updates the requirements on
[cloud-sql-python-connector[asyncpg,pg8000]](https://github.com/GoogleCloudPlatform/cloud-sql-python-connector)
to permit the latest version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/releases">cloud-sql-python-connector[asyncpg,pg8000]'s
releases</a>.</em></p>
<blockquote>
<h2>v1.20.1</h2>
<h2><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/compare/v1.20.0...v1.20.1">1.20.1</a>
(2026-03-16)</h2>
<h3>Bug Fixes</h3>
<ul>
<li>update dependencies to latest (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1379">#1379</a>)
(<a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/8f79f4ed984fbf3d742df333ddb908af0f1f08e4">8f79f4e</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/blob/main/CHANGELOG.md">cloud-sql-python-connector[asyncpg,pg8000]'s
changelog</a>.</em></p>
<blockquote>
<h2><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/compare/v1.20.0...v1.20.1">1.20.1</a>
(2026-03-16)</h2>
<h3>Bug Fixes</h3>
<ul>
<li>update dependencies to latest (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1379">#1379</a>)
(<a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/8f79f4ed984fbf3d742df333ddb908af0f1f08e4">8f79f4e</a>)</li>
</ul>
<h2><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/compare/v1.19.0...v1.20.0">1.20.0</a>
(2026-01-13)</h2>
<h3>Features</h3>
<ul>
<li>Use configured DNS name to lookup instance IP address (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1363">#1363</a>)
(<a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/18eddc49c905f3caf02b9682c3594b5939b3f9f3">18eddc4</a>),
closes <a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1362">#1362</a></li>
</ul>
<h3>Dependencies</h3>
<ul>
<li>Update project dependencies to latest (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1369">#1369</a>)
(<a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/8cb674531a9dd23520824ac136e4dce7e8ce39b4">8cb6745</a>)</li>
</ul>
<h2><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/compare/v1.18.5...v1.19.0">1.19.0</a>
(2025-12-09)</h2>
<h3>Features</h3>
<ul>
<li>Add python 3.14 and remove python 3.9 support (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1339">#1339</a>)
(<a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/a2e8c4d30deeeb73475caf3367acadc58193228f">a2e8c4d</a>)</li>
</ul>
<h3>Documentation</h3>
<ul>
<li>Add sample Cloud Run example application (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1335">#1335</a>)
(<a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/adc25f683059a3f0fe3865d648374dce087cdaaa">adc25f6</a>)</li>
<li>Update documentation to describe how to use Advanced DR write
endpoint. (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1332">#1332</a>)
(<a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/2e1ed211cad6dd63a76fa8c80df6c1d09d112778">2e1ed21</a>)</li>
</ul>
<h2><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/compare/v1.18.4...v1.18.5">1.18.5</a>
(2025-10-09)</h2>
<h3>Bug Fixes</h3>
<ul>
<li>error on connect_async() event loop mismatch (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1113">#1113</a>)
(<a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/3030b824c899c56861832c0254df3c87585d3fcb">3030b82</a>)</li>
</ul>
<h2><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/compare/v1.18.3...v1.18.4">1.18.4</a>
(2025-08-12)</h2>
<h3>Bug Fixes</h3>
<ul>
<li>bump dependencies to latest (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1317">#1317</a>)
(<a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/6ebfac67199b44ab517af7ab57027c64c784f1a1">6ebfac6</a>)</li>
</ul>
<h2><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/compare/v1.18.2...v1.18.3">1.18.3</a>
(2025-07-11)</h2>
<h3>Bug Fixes</h3>
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</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/1afc1166e5dab998315900d9480989dae3442d85"><code>1afc116</code></a>
chore(main): release 1.20.1 (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1380">#1380</a>)</li>
<li><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/0e94ddfaccf708660671a11b0a834868d393a6db"><code>0e94ddf</code></a>
chore(deps): Update dependencies to latest versions. (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1383">#1383</a>)</li>
<li><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/8f79f4ed984fbf3d742df333ddb908af0f1f08e4"><code>8f79f4e</code></a>
fix: update dependencies to latest (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1379">#1379</a>)</li>
<li><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/a62eff13cb9a86153323d61275321a10f9d8cfd6"><code>a62eff1</code></a>
chore: Refactor Github Action per b/485167538 (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1377">#1377</a>)</li>
<li><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/ac30dd08ec71d4506378b89ab93fb402d1183112"><code>ac30dd0</code></a>
chore(deps): Update dependencies to latest as of 2026-02-13 (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1375">#1375</a>)</li>
<li><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/820715822944e67a7a2a83d9962835ad43a7b2e4"><code>8207158</code></a>
chore(main): release 1.20.0 (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1364">#1364</a>)</li>
<li><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/8cb674531a9dd23520824ac136e4dce7e8ce39b4"><code>8cb6745</code></a>
deps: Update project dependencies to latest (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1369">#1369</a>)</li>
<li><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/18eddc49c905f3caf02b9682c3594b5939b3f9f3"><code>18eddc4</code></a>
feat: Use configured DNS name to lookup instance IP address (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1363">#1363</a>)</li>
<li><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/ae7db856b1197bfd09fc79923359d84c0e135d79"><code>ae7db85</code></a>
chore: add check for closed connector (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1269">#1269</a>)</li>
<li><a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/commit/b33295d3e0e4a61a486b0ee7cac915cba866b78a"><code>b33295d</code></a>
chore(main): release 1.19.0 (<a
href="https://redirect.github.com/GoogleCloudPlatform/cloud-sql-python-connector/issues/1333">#1333</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/compare/v1.18.0...v1.20.1">compare
view</a></li>
</ul>
</details>
<br />

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pyproject.toml

@@ -26,7 +26,7 @@ dependencies = [
     "asyncpg>=0.30.0",
     "pg8000>=1.31.0",  # Sync driver for Cloud SQL Connector in GitHub Actions
     "alembic>=1.14.0",
-    "cloud-sql-python-connector[asyncpg,pg8000]>=1.18.0",  # Cloud SQL Connector
+    "cloud-sql-python-connector[asyncpg,pg8000]>=1.20.2",  # Cloud SQL Connector
     # Data & Plotting
     "pandas>=3.0.0",
     "numpy>=2.0.0",