Bump mypy from 1.7.0 to 1.8.0

Bumps [mypy](https://github.com/python/mypy) from 1.7.0 to 1.8.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.7.0...v1.8.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements/dev-requirements.txt

@@ -111,7 +111,7 @@ mccabe==0.7.0
     # via
     #   flake8
     #   pylint
-mypy==1.7.0
+mypy==1.8.0
     # via -r requirements/dev-requirements.in
 mypy-extensions==1.0.0
     # via