chore(deps): update celery requirement from ~=5.3.1 to ~=5.3.4 in /api

Updates the requirements on [celery](https://github.com/celery/celery) to permit the latest version.
- [Release notes](https://github.com/celery/celery/releases)
- [Changelog](https://github.com/celery/celery/blob/main/Changelog.rst)
- [Commits](https://github.com/celery/celery/compare/v5.3.1...v5.3.4)

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

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

api/requirements.txt

@@ -1,5 +1,5 @@
 captcha~=0.5.0
-celery~=5.3.1
+celery~=5.3.4
 coverage~=7.2.7
 cryptography~=41.0.3
 Django~=4.2.2