build(deps-dev): bump types-pyyaml

Bumps [types-pyyaml](https://github.com/python/typeshed) from 6.0.12.20250915 to 6.0.12.20260408.
- [Commits](https://github.com/python/typeshed/commits)

---
updated-dependencies:
- dependency-name: types-pyyaml
  dependency-version: 6.0.12.20260408
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pyproject.toml

@@ -91,7 +91,7 @@ dev-mypy = [
   "mypy == 1.20.0",
   "types-setuptools >= 67.6.0, < 83", # Should match the api dependency
   "types-Markdown == 3.10.2.20260211",
-  "types-PyYAML == 6.0.12.20250915",
+  "types-PyYAML == 6.0.12.20260408",
   "types-babel == 2.11.0.15",
   "types-colorama == 0.4.15.20250801",
   # For checking the noxfile, docs/ script, and tests