Bump core from 5efb4f0 to cd13f18 (#3450)

Bumps [core](https://github.com/microsoft/typespec) from `5efb4f0` to
`cd13f18`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/typespec/commit/cd13f1831bdb31f2001249c6f038a6d326965861"><code>cd13f18</code></a>
Fix OpenAPI3 converter to generate separate operations for multiple
content t...</li>
<li><a
href="https://github.com/microsoft/typespec/commit/1cb56e12dc9119cef028620450b7c7d70e704484"><code>1cb56e1</code></a>
Fix: Escape <code>${</code> in OpenAPI 3 to TypeSpec conversion to
prevent string interp...</li>
<li><a
href="https://github.com/microsoft/typespec/commit/91a4347f982102131ca312444972d11d605eff28"><code>91a4347</code></a>
chore: package migration in preparation for OAI 3.2.0 support (<a
href="https://redirect.github.com/microsoft/typespec/issues/8712">#8712</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/5d549c414f9a359fd768f5130de4f029c8cb67f9"><code>5d549c4</code></a>
build: open pr if spector regen fails (<a
href="https://redirect.github.com/microsoft/typespec/issues/8832">#8832</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/96f128b82d5b96cdd6d29512df6a4dd7e58fbf13"><code>96f128b</code></a>
Add forgotten index file for http-canonicalization. (<a
href="https://redirect.github.com/microsoft/typespec/issues/8833">#8833</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/06a0b72f195af997df1ac6d212b4d3aeede101b4"><code>06a0b72</code></a>
Fix static reference writing and assign optional discriminator
properties (<a
href="https://redirect.github.com/microsoft/typespec/issues/8">#8</a>...</li>
<li><a
href="https://github.com/microsoft/typespec/commit/8c01ab765f2c9dc6a64e06215e0c5c1d6b9ad127"><code>8c01ab7</code></a>
[http-client-csharp] Implement support for external type references (<a
href="https://redirect.github.com/microsoft/typespec/issues/8770">#8770</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/71d587e81faa8fbc3bec0697b3c2f1b95b035858"><code>71d587e</code></a>
Create documentation for backward compatibility supported scenarios (<a
href="https://redirect.github.com/microsoft/typespec/issues/8809">#8809</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/9492d038748c9b80e7a43ab3bc76b16ebbe677c9"><code>9492d03</code></a>
Add mutator framework and canonicalization engine (<a
href="https://redirect.github.com/microsoft/typespec/issues/8822">#8822</a>)</li>
<li>See full diff in <a
href="https://github.com/microsoft/typespec/compare/5efb4f090af7865c6d5d2c06bd2596394db5c724...cd13f1831bdb31f2001249c6f038a6d326965861">compare
view</a></li>
</ul>
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