Bump pydantic from 2.12.3 to 2.12.4 in /docs

Bumps [pydantic](https://github.com/pydantic/pydantic) from 2.12.3 to 2.12.4.
- [Release notes](https://github.com/pydantic/pydantic/releases)
- [Changelog](https://github.com/pydantic/pydantic/blob/v2.12.4/HISTORY.md)
- [Commits](pydantic/pydantic@v2.12.3...v2.12.4)

---
updated-dependencies:
- dependency-name: pydantic
  dependency-version: 2.12.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -7,4 +7,4 @@ sphinx-codeautolink==0.17.5
 sphinx_favicon==1.0.1
 # third-party utilities
 beartype==0.22.6
-pydantic==2.12.3
+pydantic==2.12.5