chore(deps): bump pydantic-settings from 2.6.0 to 2.9.1

Bumps [pydantic-settings](https://github.com/pydantic/pydantic-settings) from 2.6.0 to 2.9.1.
- [Release notes](https://github.com/pydantic/pydantic-settings/releases)
- [Commits](pydantic/pydantic-settings@v2.6.0...v2.9.1)

---
updated-dependencies:
- dependency-name: pydantic-settings
  dependency-version: 2.9.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -39,7 +39,7 @@ openai==1.70.0
 # ------------
 python-dotenv==1.1.0
 pydantic==2.10.4
-pydantic-settings==2.6.0
+pydantic-settings==2.9.1
 python-hcl2==5.1.1
 
 # Lambda layer: langchain