Update mypy requirement from 0.921 to 0.991 (#49)

Updates the requirements on [mypy](https://github.com/python/mypy) to
permit the latest version.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/python/mypy/commit/b7788fcc4d140bbeb56531ab054bcdd53e298d30"><code>b7788fc</code></a>
Update version to remove &quot;+dev&quot; for releasing 0.991</li>
<li><a
href="https://github.com/python/mypy/commit/6077d1966e8dc84be44b9e30f590a604561b72b3"><code>6077d19</code></a>
manually CP typeshed <a
href="https://github-redirect.dependabot.com/python/mypy/issues/9130">#9130</a></li>
<li><a
href="https://github.com/python/mypy/commit/ab0ea1ec4499b8b589bd3a5da7fdd08d9e00990e"><code>ab0ea1e</code></a>
Fix crash with function redefinition (<a
href="https://github-redirect.dependabot.com/python/mypy/issues/14064">#14064</a>)</li>
<li><a
href="https://github.com/python/mypy/commit/592a9cee1368542ba252cf665ffac0f46ff783c0"><code>592a9ce</code></a>
Fix another crash with report generation on namespace packages (<a
href="https://github-redirect.dependabot.com/python/mypy/issues/14063">#14063</a>)</li>
<li><a
href="https://github.com/python/mypy/commit/1650ae00deb47ab315d5613492950dd75d51cc1a"><code>1650ae0</code></a>
Update --no-warn-no-return docs for empty body changes (<a
href="https://github-redirect.dependabot.com/python/mypy/issues/14065">#14065</a>)</li>
<li><a
href="https://github.com/python/mypy/commit/b9daa313a5326e0bb315422cafe0b1f62a33cec6"><code>b9daa31</code></a>
Don't ignore errors in files passed on the command line (<a
href="https://github-redirect.dependabot.com/python/mypy/issues/14060">#14060</a>)</li>
<li><a
href="https://github.com/python/mypy/commit/02fd8a54e72be4a8ed83049d86d1335b164283c2"><code>02fd8a5</code></a>
Filter out wasm32 wheel in upload-pypi.py (<a
href="https://github-redirect.dependabot.com/python/mypy/issues/14035">#14035</a>)</li>
<li><a
href="https://github.com/python/mypy/commit/131c8d707a3071e1d3e4dca81db47a567d25aa81"><code>131c8d7</code></a>
Fix crash on inference with recursive alias to recursive instance (<a
href="https://github-redirect.dependabot.com/python/mypy/issues/14038">#14038</a>)</li>
<li><a
href="https://github.com/python/mypy/commit/136833884fcf44dd0a6c07743ee0691ff878aad9"><code>1368338</code></a>
Change version to 0.991+dev in preparation for the point release</li>
<li><a
href="https://github.com/python/mypy/commit/b71dc3da0d8c6a4e116eef98a7ff8591145338be"><code>b71dc3d</code></a>
Remove +dev from version</li>
<li>Additional commits viewable in <a
href="https://github.com/python/mypy/compare/v0.921...v0.991">compare
view</a></li>
</ul>
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Pipfile

@@ -10,7 +10,7 @@ flake8-docstrings = "*"
 flake8-black = "*"
 flake8-copyright = "*"
 flake8-file-encoding = "*"
-mypy = "0.921"
+mypy = "0.991"
 pytest = "*"
 pyfakefs = "*"
 pytest-cov = "*"

news/202211301940.bugfix

@@ -0,0 +1 @@
+Dependency upgrade: mypy-0.991