Bump python-dotenv in /end-to-end-use-cases/whatsapp_llama_4_bot

Bumps [python-dotenv](https://github.com/theskumar/python-dotenv) from 1.1.0 to 1.2.2.
- [Release notes](https://github.com/theskumar/python-dotenv/releases)
- [Changelog](https://github.com/theskumar/python-dotenv/blob/main/CHANGELOG.md)
- [Commits](https://github.com/theskumar/python-dotenv/compare/v1.1.0...v1.2.2)

---
updated-dependencies:
- dependency-name: python-dotenv
  dependency-version: 1.2.2
  dependency-type: direct:production
...

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

end-to-end-use-cases/whatsapp_llama_4_bot/requirements.txt

@@ -31,7 +31,7 @@ pyarrow==19.0.1
 pydantic==2.11.3
 pydantic_core==2.33.1
 Pygments==2.19.1
-python-dotenv==1.1.0
+python-dotenv==1.2.2
 requests==2.32.3
 rich==13.9.4
 shellingham==1.5.4