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:production
  update-type: version-update:semver-minor
...

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

tests/requirements.txt

@@ -1,7 +1,7 @@
 black==23.3.0
 flake8==6.0.0
 isort==5.12.0
-mypy==1.3.0
+mypy==1.4.0
 pytest==7.3.0
 pytest-cov==4.1.0
 respx==0.20.1