build(deps-dev): bump mypy from 0.971 to 0.981

Bumps [mypy](https://github.com/python/mypy) from 0.971 to 0.981.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](https://github.com/python/mypy/compare/v0.971...v0.981)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements-dev.txt

@@ -20,7 +20,7 @@ flake8-noqa==1.2.9
 flake8-polyfill==1.0.2
 flake8-use-fstring==1.4
 
-mypy==0.971
+mypy==0.981
 pep8-naming==0.13.2
 safety==2.2.0
 types-requests==2.28.11