chore(deps): bump pydantic from 2.8.1 to 2.9.1

Bumps [pydantic](https://github.com/pydantic/pydantic) from 2.8.1 to 2.9.1.
- [Release notes](https://github.com/pydantic/pydantic/releases)
- [Changelog](https://github.com/pydantic/pydantic/blob/main/HISTORY.md)
- [Commits](pydantic/pydantic@v2.8.1...v2.9.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -28,7 +28,7 @@ openpyxl==3.1.5
     # via kohlrahbi (pyproject.toml)
 pandas==2.2.2
     # via kohlrahbi (pyproject.toml)
-pydantic==2.8.1
+pydantic==2.9.1
     # via kohlrahbi (pyproject.toml)
 pydantic-core==2.23.3
     # via pydantic