Bump mypy from 1.4.1 to 1.8.0

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] <[email protected]>

mypy-requirements.txt

@@ -1,2 +1,2 @@
 -r test-requirements.txt
-mypy==1.4.1
+mypy==1.8.0