Bump mypy from 1.3.0 to 1.4.0

Bumps [mypy](https://github.com/python/mypy) from 1.3.0 to 1.4.0.
- [Commits](python/mypy@v1.3.0...v1.4.0)

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

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

requirements-dev.txt

@@ -5,6 +5,6 @@ flake8-bandit==4.1.1
 flake8-bugbear==23.6.5
 flake8-import-order==0.18.2
 flake8-requirements==1.7.8
-mypy==1.3.0; implementation_name=="cpython"
+mypy==1.4.0; implementation_name=="cpython"
 pre-commit==3.3.3
 sphinx==7.0.1