Bump pydantic-settings from 2.3.4 to 2.4.0

Bumps [pydantic-settings](https://github.com/pydantic/pydantic-settings) from 2.3.4 to 2.4.0.
- [Release notes](https://github.com/pydantic/pydantic-settings/releases)
- [Commits](pydantic/pydantic-settings@v2.3.4...v2.4.0)

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

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

Author: dependabot[bot]

docs/requirements.txt

@@ -3,4 +3,4 @@ pallets_sphinx_themes==2.1.3
 myst-parser==3.0.1
 autodoc_pydantic==2.2.0
 pydantic==2.8.2
-pydantic-settings==2.3.4
+pydantic-settings==2.4.0