Bump core from 913aa03 to 4ed71bf (Azure#1012)

Bumps [core](https://github.com/microsoft/typespec) from `913aa03` to
`4ed71bf`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/typespec/commit/4ed71bf73fe51292c52676849b8462ced86005fb"><code>4ed71bf</code></a>
Add release notes for 0.57.0 (<a
href="https://redirect.github.com/microsoft/typespec/issues/3560">#3560</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/147335dfd54a831f0fb0440811510abc95a105e9"><code>147335d</code></a>
fix error when model property is invalid (<a
href="https://redirect.github.com/microsoft/typespec/issues/3574">#3574</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/e4c4d2b7ca4271f954c5cbda7c7ddfa542099e34"><code>e4c4d2b</code></a>
Add support for completion of extends and is (<a
href="https://redirect.github.com/microsoft/typespec/issues/3443">#3443</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/5bc98d9c9dd1bb4fb04746446026b01dea7096ba"><code>5bc98d9</code></a>
Fix: Using a scalar constructor defined in a parent scalar doesn't
reference ...</li>
<li><a
href="https://github.com/microsoft/typespec/commit/35e8625014e468bd7079a2c53e4b45b1d17c39e0"><code>35e8625</code></a>
support loglevel filter in playground (<a
href="https://redirect.github.com/microsoft/typespec/issues/3569">#3569</a>)</li>
<li>See full diff in <a
href="https://github.com/microsoft/typespec/compare/913aa03f78cf5b85b03c5efc5a8666b45f48d514...4ed71bf73fe51292c52676849b8462ced86005fb">compare
view</a></li>
</ul>
</details>
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