Bump core from 4234073 to 91f0042 (#1588)

Bumps [core](https://github.com/microsoft/typespec) from `4234073` to
`91f0042`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/typespec/commit/91f0042a57fff1dc071c6325ff5258271413ab35"><code>91f0042</code></a>
Java codegen, use TCGC enum name for MPG (<a
href="https://github.com/microsoft/typespec/issues/4315">#4315</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/594dc976bb3dfdf369aa5da408f127cad9ef9907"><code>594dc97</code></a>
http-client-java, emitter, bump tcgc version to 0.46.1 (<a
href="https://github.com/microsoft/typespec/issues/4476">#4476</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/0b084499436c0433119709e95cbbb98e9477058a"><code>0b08449</code></a>
Use shell for execution of .cmd (tsp-server.cmd) (<a
href="https://github.com/microsoft/typespec/issues/4430">#4430</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/4d46e4f5e9d391233e22d719de208de582dc08e0"><code>4d46e4f</code></a>
Move property replacement to visitor (<a
href="https://github.com/microsoft/typespec/issues/4482">#4482</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/da0fbc23b2bb8091f9e93346c3911be4897c1ea6"><code>da0fbc2</code></a>
Add support for suppressing members (<a
href="https://github.com/microsoft/typespec/issues/4479">#4479</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/ef37eadcf8b35924c2abcbc55002780a6bf70f13"><code>ef37ead</code></a>
Fix encoded names doc not referenced (<a
href="https://github.com/microsoft/typespec/issues/4478">#4478</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/7356b46d6c76f43afcabebe9358f717b88e8ea43"><code>7356b46</code></a>
Add tests for supporting adding custom model props (<a
href="https://github.com/microsoft/typespec/issues/4474">#4474</a>)</li>
<li>See full diff in <a
href="https://github.com/microsoft/typespec/compare/423407330c29b3bed534cd24b44b7c69dbecc294...91f0042a57fff1dc071c6325ff5258271413ab35">compare
view</a></li>
</ul>
</details>
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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>