Bump core from 69e93a8 to cb5496d (Azure#271)

Bumps [core](https://github.com/microsoft/typespec) from `69e93a8` to
`cb5496d`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/typespec/commit/cb5496de4c2d516b25f5267edfe98e8240ffdf91"><code>cb5496d</code></a>
Update homepage.tsx (<a
href="https://redirect.github.com/microsoft/typespec/issues/2921">#2921</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/da70950269cbf1997e201a4bbbfe78c53129a6d6"><code>da70950</code></a>
Sign VSCode and Visual Studio extensions &amp; pipeline organization (<a
href="https://redirect.github.com/microsoft/typespec/issues/2913">#2913</a>)</li>
<li>See full diff in <a
href="https://github.com/microsoft/typespec/compare/69e93a8310b09ac75af742bf6b25eb75466d07a5...cb5496de4c2d516b25f5267edfe98e8240ffdf91">compare
view</a></li>
</ul>
</details>
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