build(deps-dev): bump mypy from 0.971 to 0.991 (#308)

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

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

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

pyproject.toml

@@ -35,7 +35,7 @@ pytz = ">=2021.3,<2023.0"
 pytest = "^7.1.3"
 coverage = {extras = ["toml"], version = "^6.5"}
 safety = "^2.2.0"
-mypy = "^0.971"
+mypy = "^0.991"
 typeguard = "^2.13.2"
 xdoctest = {extras = ["colors"], version = "^1.1.0"}
 sphinx = "^4.3.2"