Bump mypy from 1.8.0 to 1.9.0

Bumps [mypy](https://github.com/python/mypy) from 1.8.0 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:production
  update-type: version-update:semver-minor
...

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

pyproject.toml

@@ -46,7 +46,7 @@ docs = [
 
 dev = [
     "black==24.3.0",
-    "mypy==1.8.0",
+    "mypy==1.9.0",
     "pydicom-data",
     "pytest",
     "pytest-cov",