Bump core from 7bbe89c to 1d38178 (#667)

Bumps [core](https://github.com/microsoft/typespec) from `7bbe89c` to
`1d38178`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/typespec/commit/1d381789fe53ad922b95dafe1a037335c70f27af"><code>1d38178</code></a>
Add dynamic checking for running each sub stage (<a
href="https://github.com/microsoft/typespec/issues/3162">#3162</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/b4caac6425b6870dfb8f2c818041eb112e84473a"><code>b4caac6</code></a>
Fix completion of keywords (<a
href="https://github.com/microsoft/typespec/issues/3151">#3151</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/f30120d3a5f6876bccbb27290c64497e5bce4197"><code>f30120d</code></a>
Fix: Model with spread indexer shouldn't validate explicit properites
(<a
href="https://github.com/microsoft/typespec/issues/3163">#3163</a>)</li>
<li>See full diff in <a
href="https://github.com/microsoft/typespec/compare/7bbe89cb17e2ecb14bda0ba5980251eedfe91131...1d381789fe53ad922b95dafe1a037335c70f27af">compare
view</a></li>
</ul>
</details>
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