Bump types-pyyaml in /requirements/partial

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]

requirements/partial/requirements_development.txt

@@ -16,7 +16,7 @@ pyupgrade==3.21.2
 types-babel==2.11.0.15
 types-beautifulsoup4==4.12.0.20250516
 types-bleach==6.3.0.20251115
-types-PyYAML==6.0.12.20250915
+types-PyYAML==6.0.12.20260408
 types-requests==2.32.4.20260107
 types-simplejson==3.20.0.20250822
 types-Pygments==2.19.0.20251121