Bump pydantic from 2.9.0 to 2.9.1

Bumps [pydantic](https://github.com/pydantic/pydantic) from 2.9.0 to 2.9.1.
- [Release notes](https://github.com/pydantic/pydantic/releases)
- [Changelog](https://github.com/pydantic/pydantic/blob/main/HISTORY.md)
- [Commits](https://github.com/pydantic/pydantic/compare/v2.9.0...v2.9.1)

---
updated-dependencies:
- dependency-name: pydantic
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

docs/requirements.txt

@@ -2,5 +2,5 @@ sphinx==8.0.2
 pallets_sphinx_themes==2.1.3
 myst-parser==4.0.0
 autodoc_pydantic==2.2.0
-pydantic==2.9.0
+pydantic==2.9.1
 pydantic-settings==2.4.0