Bump mypy from 1.6.0 to 1.6.1 (#261)

Bumps [mypy](https://github.com/python/mypy) from 1.6.0 to 1.6.1.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/python/mypy/commit/9b891fe5a101ecbb818f3f16641ab909f289ba04"><code>9b891fe</code></a>
Remove +dev from version</li>
<li><a
href="https://github.com/python/mypy/commit/6b6504eb8a96fa6a9c7b8f034803eb9a0444fe86"><code>6b6504e</code></a>
Fix crash on ParamSpec unification (for real) (<a
href="https://redirect.github.com/python/mypy/issues/16259">#16259</a>)</li>
<li><a
href="https://github.com/python/mypy/commit/eb81e63e9dec4dd4c75b307871d1ef9b3e350838"><code>eb81e63</code></a>
Fix crash on ParamSpec unification (<a
href="https://redirect.github.com/python/mypy/issues/16251">#16251</a>)</li>
<li><a
href="https://github.com/python/mypy/commit/45f7a12e558e4a48446af3b36494dcb4045c1028"><code>45f7a12</code></a>
Add +dev to version</li>
<li>See full diff in <a
href="https://github.com/python/mypy/compare/v1.6.0...v1.6.1">compare
view</a></li>
</ul>
</details>
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