chore(deps): bump mypy from 1.4.1 to 1.8.0 (#50)

Bumps [mypy](https://github.com/python/mypy) from 1.4.1 to 1.8.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.4.1...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/test.txt

@@ -8,4 +8,4 @@ pytest-cov
 pytest-click
 pyfakefs >=3.7.1
 
-mypy ==1.4.1
+mypy ==1.8.0