Bump pydantic-settings from 2.5.2 to 2.6.0

Bumps [pydantic-settings](https://github.com/pydantic/pydantic-settings) from 2.5.2 to 2.6.0.
- [Release notes](https://github.com/pydantic/pydantic-settings/releases)
- [Commits](pydantic/pydantic-settings@v2.5.2...v2.6.0)

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

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

requirements/prod.txt

@@ -1,2 +1,2 @@
 fastapi[all]==0.115.2
-pydantic-settings==2.5.2
+pydantic-settings==2.6.0