Bump core from fa540a9 to 7517c91 (#728)

Bumps [core](https://github.com/microsoft/typespec) from `fa540a9` to
`7517c91`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/typespec/commit/7517c9175e07a472634027fdbba25e0cd8c94c66"><code>7517c91</code></a>
docs: fix incorrect example code in namespaces.md (<a
href="https://redirect.github.com/microsoft/typespec/issues/3195">#3195</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/eb1185103db31a5897f4edfd103dee974343e366"><code>eb11851</code></a>
Fix: Do not crash when trying to access member of aliased expression (<a
href="https://redirect.github.com/microsoft/typespec/issues/3188">#3188</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/b7e45f008ff7db2f2a2a2ce91c3d139bc596652e"><code>b7e45f0</code></a>
Fix <code>@path</code> param mapping when spreading a record in
operation parameters (<a
href="https://redirect.github.com/microsoft/typespec/issues/3">#3</a>...</li>
<li><a
href="https://github.com/microsoft/typespec/commit/5fa3d787293518d7629cf0c1cd3f110c4323b442"><code>5fa3d78</code></a>
Add new <code>sourceModels</code> property to model (<a
href="https://redirect.github.com/microsoft/typespec/issues/3191">#3191</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/1987a562200f17fcd4cc9304ba1ce8316a6ef65d"><code>1987a56</code></a>
Fix password flow (<a
href="https://redirect.github.com/microsoft/typespec/issues/3196">#3196</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/d2292f02807802f3b19dce24d868be57da65c9bc"><code>d2292f0</code></a>
Move generator over to microsoft/typespec (<a
href="https://redirect.github.com/microsoft/typespec/issues/3175">#3175</a>)</li>
<li>See full diff in <a
href="https://github.com/microsoft/typespec/compare/fa540a97ba5cda9303138615c892ea775db83372...7517c9175e07a472634027fdbba25e0cd8c94c66">compare
view</a></li>
</ul>
</details>
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