Chore(deps-dev): Update mypy requirement from <1.19 to <1.20

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@v0.1.0...v1.19.1)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.19.1
  dependency-type: direct:development
...

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

Author: dependabot[bot]

pyproject.toml

@@ -90,7 +90,7 @@ dependencies = [
 ]
 optional-dependencies.develop = [
   "black<26",
-  "mypy<1.19",
+  "mypy<1.20",
   "poethepoet<1",
   "pyproject-fmt<3",
   "ruff<0.15",