Bump mypy from 1.7.1 to 1.9.0

Bumps [mypy](https://github.com/python/mypy) from 1.7.1 to 1.9.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.7.1...1.9.0)

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

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

Author: dependabot[bot]

requirements-tests.txt

@@ -1,5 +1,5 @@
 django-stubs
-mypy == 1.7.1
+mypy == 1.9.0
 ninja-schema>=0.13.4
 pytest
 pytest-asyncio==0.20.3