Bump mypy from 0.971 to 0.991 (#7)

Bumps [mypy](https://github.com/python/mypy) from 0.971 to 0.991.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.971...v0.991)

---
updated-dependencies:
- dependency-name: mypy
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

poetry.lock

@@ -16,7 +16,7 @@ nox = "^2022.8.7"
 sphinx = "^5.3.0"
 rich = "^12.6.0"
 pytest = "^7.1.3"
-mypy = "^0.971"
+mypy = ">=0.971,<0.992"
 sphinx-copybutton = "^0.5.0"
 furo = "^2022.9.15"
 scriv = ">=0.17,<1.1"