chore(deps): bump pydantic-settings from 2.7.1 to 2.9.1

Bumps [pydantic-settings](https://github.com/pydantic/pydantic-settings) from 2.7.1 to 2.9.1.
- [Release notes](https://github.com/pydantic/pydantic-settings/releases)
- [Commits](pydantic/pydantic-settings@v2.7.1...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/base.txt

@@ -10,7 +10,7 @@ langchain-experimental
 pinecone-client==5.0.1
 pinecone-text==0.10.0
 pydantic==2.10.4
-pydantic-settings==2.7.1
+pydantic-settings==2.9.1
 python-dotenv==1.1.0
 pypdf==5.4.0
 tiktoken==0.9.0