Bump filelock in /end-to-end-use-cases/whatsapp_llama_4_bot

Bumps [filelock](https://github.com/tox-dev/py-filelock) from 3.18.0 to 3.20.3.
- [Release notes](https://github.com/tox-dev/py-filelock/releases)
- [Changelog](https://github.com/tox-dev/filelock/blob/main/docs/changelog.rst)
- [Commits](tox-dev/filelock@3.18.0...3.20.3)

---
updated-dependencies:
- dependency-name: filelock
  dependency-version: 3.20.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

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

@@ -14,7 +14,7 @@ dotenv==0.9.9
 eval_type_backport==0.2.2
 exceptiongroup==1.2.2
 fastapi==0.115.12
-filelock==3.18.0
+filelock==3.20.3
 frozenlist==1.5.0
 groq==0.22.0
 h11>=0.16.0