chore(deps): bump pydantic from 2.3.0 to 2.4.0 in /backend

Bumps [pydantic](https://github.com/pydantic/pydantic) from 2.3.0 to 2.4.0.
- [Release notes](https://github.com/pydantic/pydantic/releases)
- [Changelog](https://github.com/pydantic/pydantic/blob/main/HISTORY.md)
- [Commits](pydantic/pydantic@v2.3.0...v2.4.0)

---
updated-dependencies:
- dependency-name: pydantic
  dependency-type: direct:production
...

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

backend/requirements.txt

@@ -21,7 +21,7 @@ grpcio-tools==1.57.0
 minio==7.1.14
 django-prometheus==2.3.1
 django-filter==23.2
-pydantic==2.3.0
+pydantic==2.4.0
 redis==5.0.0
 mozilla-django-oidc==3.0.0
 # Dependencies used in local dev mode