deps(python): update cloud-sql-python-connector[asyncpg,pg8000] requirement

Updates the requirements on [cloud-sql-python-connector[asyncpg,pg8000]](https://github.com/GoogleCloudPlatform/cloud-sql-python-connector) to permit the latest version.
- [Release notes](https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/releases)
- [Changelog](https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/blob/main/CHANGELOG.md)
- [Commits](GoogleCloudPlatform/cloud-sql-python-connector@v1.18.0...v1.20.1)

---
updated-dependencies:
- dependency-name: cloud-sql-python-connector[asyncpg,pg8000]
  dependency-version: 1.20.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

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]>=1.20.1",  # Cloud SQL Connector
     # Data & Plotting
     "pandas>=3.0.0",
     "numpy>=2.0.0",