Bump core from 0a6c595 to 87b92d5 (#2165)

Bumps [core](https://github.com/microsoft/typespec) from `0a6c595` to
`87b92d5`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/typespec/commit/87b92d54ef6e9c611f86eba7f121a3fd49e3835a"><code>87b92d5</code></a>
Fix api-extractor warnings (<a
href="https://redirect.github.com/microsoft/typespec/issues/5846">#5846</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/6e5f69c77cef0df72f872f198bc873068eca168f"><code>6e5f69c</code></a>
Fix sample command of changing output-dir (<a
href="https://redirect.github.com/microsoft/typespec/issues/5840">#5840</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/212a5495d921aac8018c84510e2cb870ea877e5b"><code>212a549</code></a>
Pass <code>tracer</code> to <code>SourceLoader</code> to fix tracing (<a
href="https://redirect.github.com/microsoft/typespec/issues/5833">#5833</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/697b15e1aef8b960a38e3d759be16316bdeac0a6"><code>697b15e</code></a>
Upgrade corepack to fix key integrity issue (<a
href="https://redirect.github.com/microsoft/typespec/issues/5837">#5837</a>)</li>
<li>See full diff in <a
href="https://github.com/microsoft/typespec/compare/0a6c595ea48a0c1b64bb464f53c88d9969e0ef64...87b92d54ef6e9c611f86eba7f121a3fd49e3835a">compare
view</a></li>
</ul>
</details>
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