fix: bump gradio from 6.15.0 to 6.15.1 in /packages/bigframes (#17712)

Bumps [gradio](https://github.com/gradio-app/gradio) from 6.15.0 to
6.15.1.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/gradio-app/gradio/blob/main/CHANGELOG.md">gradio's
changelog</a>.</em></p>
<blockquote>
<h2>6.15.1</h2>
<h3>Features</h3>
<ul>
<li><a
href="https://redirect.github.com/gradio-app/gradio/pull/13388">#13388</a>
<a
href="https://github.com/gradio-app/gradio/commit/c889673a242c2a368c2a222da34c8267491d0495"><code>c889673</code></a>
- tests:add regression coverage for the
<code>Blocks.from_config()</code> proxy_url SSRF guard
(GHSA-jmh7-g254-2cq9). Thanks <a
href="https://github.com/xr843"><code>@​xr843</code></a>!</li>
</ul>
<h3>Fixes</h3>
<ul>
<li><a
href="https://redirect.github.com/gradio-app/gradio/pull/13394">#13394</a>
<a
href="https://github.com/gradio-app/gradio/commit/1c609af6918b20d0b4347b9f41b04569d6adca24"><code>1c609af</code></a>
- Fix audio cache keys to include metadata. Thanks <a
href="https://github.com/3em0"><code>@​3em0</code></a>!</li>
<li><a
href="https://redirect.github.com/gradio-app/gradio/pull/13424">#13424</a>
<a
href="https://github.com/gradio-app/gradio/commit/14ccbf1115d30b7bb666f7d11264bd9280a40176"><code>14ccbf1</code></a>
- Defer Node front proxy startup until Python is ready in SSR mode.
Thanks <a href="https://github.com/pngwn"><code>@​pngwn</code></a>!</li>
<li><a
href="https://redirect.github.com/gradio-app/gradio/pull/13391">#13391</a>
<a
href="https://github.com/gradio-app/gradio/commit/270c12a8ea382d20ce701e391fea61b12badbf5c"><code>270c12a</code></a>
- fix(dataframe): handle empty and 1d auto datatype values. Thanks <a
href="https://github.com/danyalahmed1995"><code>@​danyalahmed1995</code></a>!</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/gradio-app/gradio/commit/e3a20f80fcde1430bac7ba29144ff094d59f74f2"><code>e3a20f8</code></a>
chore: update versions (<a
href="https://redirect.github.com/gradio-app/gradio/issues/13419">#13419</a>)</li>
<li><a
href="https://github.com/gradio-app/gradio/commit/14ccbf1115d30b7bb666f7d11264bd9280a40176"><code>14ccbf1</code></a>
Ssr node port (<a
href="https://redirect.github.com/gradio-app/gradio/issues/13424">#13424</a>)</li>
<li><a
href="https://github.com/gradio-app/gradio/commit/270c12a8ea382d20ce701e391fea61b12badbf5c"><code>270c12a</code></a>
fix(dataframe): handle empty and 1d auto datatype values (<a
href="https://redirect.github.com/gradio-app/gradio/issues/13391">#13391</a>)</li>
<li><a
href="https://github.com/gradio-app/gradio/commit/c889673a242c2a368c2a222da34c8267491d0495"><code>c889673</code></a>
test: regression coverage for from_config proxy_url SSRF guard
(GHSA-jmh7-g25...</li>
<li><a
href="https://github.com/gradio-app/gradio/commit/1c609af6918b20d0b4347b9f41b04569d6adca24"><code>1c609af</code></a>
Fix audio cache keys to include metadata (<a
href="https://redirect.github.com/gradio-app/gradio/issues/13394">#13394</a>)</li>
<li>See full diff in <a
href="https://github.com/gradio-app/gradio/compare/gradio@6.15.0...gradio@6.15.1">compare
view</a></li>
</ul>
</details>
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packages/bigframes/testing/constraints-3.11.txt

@@ -172,7 +172,7 @@ google-pasta==0.2.0
 google-resumable-media==2.7.2
 googleapis-common-protos==1.70.0
 googledrivedownloader==1.1.0
-gradio==6.15.0
+gradio==6.15.1
 gradio_client==1.11.0
 graphviz==0.21
 greenlet==3.2.3