Bump mypy from v1.8.0 to 1.9.0 (#1117)

Bumps [mypy](https://github.com/python/mypy) from v1.8.0 to 1.9.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.8.0...1.9.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

setup.py

@@ -80,7 +80,7 @@
             "mypy==v0.910 ; python_version<'3.6'",
             "mypy==v0.971 ; python_version>='3.6' and python_version<'3.7'",
             "mypy==v1.4.1 ; python_version>='3.7' and python_version<'3.8'",
-            "mypy==v1.8.0 ; python_version>='3.8'",
+            "mypy==v1.9.0 ; python_version>='3.8'",
             # Docs.
             "Sphinx==7.2.5 ; python_version>='3.9'",
             "sphinx-autobuild==2024.2.4 ; python_version>='3.9'",