Bump site-shared from 543ceb8 to b2ffb98 (#11788)

Bumps [site-shared](https://github.com/dart-lang/site-shared) from
`543ceb8` to `b2ffb98`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dart-lang/site-shared/commit/b2ffb98eaf2d4022ebfc8ceb0af268f2e6449d13"><code>b2ffb98</code></a>
Analyze and format with Dart 3.7 (<a
href="https://redirect.github.com/dart-lang/site-shared/issues/240">#240</a>)</li>
<li><a
href="https://github.com/dart-lang/site-shared/commit/ff290b53d54080e2f1e49eeab4582e0104865b8e"><code>ff290b5</code></a>
Bump the github-actions group with 2 updates (<a
href="https://redirect.github.com/dart-lang/site-shared/issues/239">#239</a>)</li>
<li>See full diff in <a
href="https://github.com/dart-lang/site-shared/compare/543ceb8aba856faad616d3ddec2a739907d995e2...b2ffb98eaf2d4022ebfc8ceb0af268f2e6449d13">compare
view</a></li>
</ul>
</details>
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Author: dependabot[bot]