build(deps): bump pydantic from 2.11.7 to 2.11.9

Bumps [pydantic](https://github.com/pydantic/pydantic) from 2.11.7 to 2.11.9.
- [Release notes](https://github.com/pydantic/pydantic/releases)
- [Changelog](https://github.com/pydantic/pydantic/blob/v2.11.9/HISTORY.md)
- [Commits](https://github.com/pydantic/pydantic/compare/v2.11.7...v2.11.9)

---
updated-dependencies:
- dependency-name: pydantic
  dependency-version: 2.11.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements.txt

@@ -18,7 +18,7 @@ pendulum==3.1.0
 platformdirs==4.4.0
 psutil==7.0.0
 pvlib==0.13.0
-pydantic==2.11.7
+pydantic==2.11.9
 statsmodels==0.14.5
 pydantic-settings==2.10.1
 linkify-it-py==2.0.3