Bump core from f4c8710 to 99abec9 (#1503)

Bumps [core](https://github.com/microsoft/typespec) from `f4c8710` to
`99abec9`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/typespec/commit/99abec93e9551e61a4393f6fd55e99db54efd3e9"><code>99abec9</code></a>
http-client-java_add-cadl-ranch-tests (<a
href="https://redirect.github.com/microsoft/typespec/issues/4368">#4368</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/27c263ee68c252f21655188931dbb18045ad67b4"><code>27c263e</code></a>
http-client-java, corner case of client without op or group (<a
href="https://redirect.github.com/microsoft/typespec/issues/4358">#4358</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/5a55338defa793c4479c234f2be2218a9a3bc9b8"><code>5a55338</code></a>
[Bug] Fix semantic walker not firing exitOperation or exitModelProperty
(<a
href="https://redirect.github.com/microsoft/typespec/issues/4381">#4381</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/c6809aa94d89a0cf410a4e0d0bbdd8b2b96a2da2"><code>c6809aa</code></a>
Porting fix from autorest.java (<a
href="https://redirect.github.com/microsoft/typespec/issues/4371">#4371</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/a714eea53c605eb34e03f60f12b9ee2b058017b9"><code>a714eea</code></a>
Move property name set to ModelProvider (<a
href="https://redirect.github.com/microsoft/typespec/issues/4374">#4374</a>)</li>
<li>See full diff in <a
href="https://github.com/microsoft/typespec/compare/f4c8710673139b1d05cb77717f897b717efa1d7d...99abec93e9551e61a4393f6fd55e99db54efd3e9">compare
view</a></li>
</ul>
</details>
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