Bump mypy from 1.3.0 to 1.8.0

Bumps [mypy](https://github.com/python/mypy) from 1.3.0 to 1.8.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.3.0...v1.8.0)

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

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

requirements/pkgutils.txt

@@ -5,4 +5,4 @@ tox>=4.4.8
 sphinx2rst>=1.0
 bumpversion
 pydocstyle==6.3.0
-mypy==1.3.0
+mypy==1.8.0