Bump core from 9881002 to 7312314 (#373)

Bumps [core](https://github.com/microsoft/typespec) from `9881002` to
`7312314`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/typespec/commit/7312314bcbe7a4fa58129687d7212f5051ec274c"><code>7312314</code></a>
Remove old message burried in changelog (<a
href="https://redirect.github.com/microsoft/typespec/issues/2989">#2989</a>)</li>
<li>See full diff in <a
href="https://github.com/microsoft/typespec/compare/9881002f1c26ab6cc9e1ff6f0a485c1d4f54a3af...7312314bcbe7a4fa58129687d7212f5051ec274c">compare
view</a></li>
</ul>
</details>
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