chore(deps-dev): update mypy requirement from 1.8.0 to 1.9.0 (#83)

Updates the requirements on [mypy](https://github.com/python/mypy) to permit the latest version.
- [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
...

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pyproject.toml

@@ -61,7 +61,7 @@ defusedxml = "^0.7.1"
 tox = "4.11.4"
 coverage = "7.4.3"
 xmldiff = "2.6.3"
-mypy =  "1.8.0"
+mypy =  "1.9.0"
 autopep8 = "2.0.4"
 isort = "5.13.2"
 flake8 = { version="7.0.0", python=">=3.8.1" }