Bump core from 7e344d4 to 3bd6a87 (#1989)

Bumps [core](https://github.com/microsoft/typespec) from `7e344d4` to
`3bd6a87`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/typespec/commit/3bd6a8758cb12b0f182c03d70f2c39781a0d84af"><code>3bd6a87</code></a>
introduce the abstraction for tokencredential type and keycredential
type (<a
href="https://redirect.github.com/microsoft/typespec/issues/5">#5</a>...</li>
<li><a
href="https://github.com/microsoft/typespec/commit/9bc1675cc5013be49b3af4b0f1c441d95e011541"><code>9bc1675</code></a>
Adopt http/special-headers/conditional-request from cadl ranch (<a
href="https://redirect.github.com/microsoft/typespec/issues/5318">#5318</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/7ad5e779bcad446884e1a95fcecff5a22c5dc2c9"><code>7ad5e77</code></a>
[http-client-csharp] Bump typespec version to 0.63.0 (<a
href="https://redirect.github.com/microsoft/typespec/issues/5354">#5354</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/6f6ee2a31d684cd4239a80e4abbe69a32ad8da7e"><code>6f6ee2a</code></a>
<code>typespec</code> repository - Upload Manifest file to the new
storage account (<a
href="https://redirect.github.com/microsoft/typespec/issues/5336">#5336</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/b1476de1fdd0326c90a06b50b05ef1a41e7a652c"><code>b1476de</code></a>
http-client-java, migrate to http-specs (<a
href="https://redirect.github.com/microsoft/typespec/issues/5215">#5215</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/cc6f41abb14d14d716f4188abe0f2b118f16c86b"><code>cc6f41a</code></a>
[python] bump tsp 0.63.0 (<a
href="https://redirect.github.com/microsoft/typespec/issues/5352">#5352</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/c315925a7e9c158606bb1305e290b8c5547b1980"><code>c315925</code></a>
http-client-java, remove code of convert contentType to header param (<a
href="https://redirect.github.com/microsoft/typespec/issues/5351">#5351</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/df5a8854d22b73a6ac67a73f7f5da475631d9ca3"><code>df5a885</code></a>
http-client-java, unify branded/unbranded ExpandableEnum (<a
href="https://redirect.github.com/microsoft/typespec/issues/5334">#5334</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/093e98620a616a31ce5d43857d9b3a758c36fc72"><code>093e986</code></a>
http-client-java, map typespec.rest.resource model to sdk base namespace
(<a
href="https://redirect.github.com/microsoft/typespec/issues/5349">#5349</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/b2c14ccb8f240c85a52351d547eaa71b8638886c"><code>b2c14cc</code></a>
bump TCGC version to 0.48.6 (<a
href="https://redirect.github.com/microsoft/typespec/issues/5331">#5331</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/microsoft/typespec/compare/7e344d4ae6af65297adaac7b874218e703bbbdfa...3bd6a8758cb12b0f182c03d70f2c39781a0d84af">compare
view</a></li>
</ul>
</details>
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