Bump core from e9b17b3 to aa6e53f (Azure#320)

Bumps [core](https://github.com/microsoft/typespec) from `e9b17b3` to
`aa6e53f`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/typespec/commit/aa6e53f4ab9a12dde617900cb1c4c68152527b61"><code>aa6e53f</code></a>
Add <code>getOpenAPI3</code> to OpenAPI3 emitter (<a
href="https://redirect.github.com/microsoft/typespec/issues/2950">#2950</a>)</li>
<li>See full diff in <a
href="https://github.com/microsoft/typespec/compare/e9b17b384d4dbe9ce0ee92c35f5c4332d275ff21...aa6e53f4ab9a12dde617900cb1c4c68152527b61">compare
view</a></li>
</ul>
</details>
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