Bump core from 9c701cc to 216f423 (Azure#1019)

Bumps [core](https://github.com/microsoft/typespec) from `9c701cc` to
`216f423`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/typespec/commit/216f423a8c4330410a4a6352fc9d2be5f4ee8413"><code>216f423</code></a>
Fix crash in program viewer when trying to display new value type (<a
href="https://github.com/microsoft/typespec/issues/3585">#3585</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/d319e3324adcb2e33e5bababfe8f7267fac38052"><code>d319e33</code></a>
Add new const keyword breaking note (<a
href="https://github.com/microsoft/typespec/issues/3584">#3584</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/d7ec3da673459e6bde92084603f41493d1301f2a"><code>d7ec3da</code></a>
Add discord link to website (<a
href="https://github.com/microsoft/typespec/issues/3586">#3586</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/6bbc24757053ccd1ff36fc5d40b5acbf29f00e30"><code>6bbc247</code></a>
Fix formatting of object and array literal in decorator (<a
href="https://github.com/microsoft/typespec/issues/3577">#3577</a>)</li>
<li>See full diff in <a
href="https://github.com/microsoft/typespec/compare/9c701cc27264e0d635e622e823270d0c054f64a9...216f423a8c4330410a4a6352fc9d2be5f4ee8413">compare
view</a></li>
</ul>
</details>
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Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
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