Bump site-shared from a22e28b to ee4732c (#9705)

Bumps [site-shared](https:/dart-lang/site-shared) from
`a22e28b` to `ee4732c`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https:/dart-lang/site-shared/commit/ee4732c1960ec46d1454c327e18bd4126996b0bf"><code>ee4732c</code></a>
Update package dependency constraints and generated CI (<a
href="https://redirect.github.com/dart-lang/site-shared/issues/194">#194</a>)</li>
<li>See full diff in <a
href="https:/dart-lang/site-shared/compare/a22e28b2596869aa7fd9a01b8a02dfb5df32a853...ee4732c1960ec46d1454c327e18bd4126996b0bf">compare
view</a></li>
</ul>
</details>
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