Bump core from ad635d9 to 89e19ef (#1492)

Bumps [core](https://github.com/microsoft/typespec) from `ad635d9` to
`89e19ef`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/typespec/commit/89e19ef521ba988f5c4c18c8036b55d47206239d"><code>89e19ef</code></a>
Change the property names to be lower case letter in the
tspCodeModel.json (#...</li>
<li><a
href="https://github.com/microsoft/typespec/commit/d836c427bea5258375d85771d75b36f6572a79f4"><code>d836c42</code></a>
http-client-java, sync code from autorest.java (<a
href="https://redirect.github.com/microsoft/typespec/issues/4345">#4345</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/7219aa403574b472ac9f4f259301a30f59b290ad"><code>7219aa4</code></a>
http-client-java, update cadl-ranch, handle TCGC multipart logic (<a
href="https://redirect.github.com/microsoft/typespec/issues/4352">#4352</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/f329e038f80bfc6e835356caca06753b42c6053a"><code>f329e03</code></a>
Java codegen: disable dependency transfer logging (<a
href="https://redirect.github.com/microsoft/typespec/issues/4355">#4355</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/1c2154cbda982179c5e5d4950003ae266c3baa47"><code>1c2154c</code></a>
Fix anonymous union variant in tree viewer (<a
href="https://redirect.github.com/microsoft/typespec/issues/4353">#4353</a>)</li>
<li>See full diff in <a
href="https://github.com/microsoft/typespec/compare/ad635d920e7694c2375fc44c88d88a02a001705e...89e19ef521ba988f5c4c18c8036b55d47206239d">compare
view</a></li>
</ul>
</details>
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