Bump requests from 2.32.3 to 2.33.0 in /backend

Bumps [requests](https://github.com/psf/requests) from 2.32.3 to 2.33.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.32.3...v2.33.0)

---
updated-dependencies:
- dependency-name: requests
  dependency-version: 2.33.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

backend/requirements-pinned.txt

@@ -186,7 +186,7 @@ referencing==0.35.1
     # via
     #   jsonschema
     #   jsonschema-specifications
-requests==2.32.3
+requests==2.33.0
     # via
     #   connexion
     #   google-api-core