Bump celery from 5.3.6 to 5.4.0

Bumps [celery](https://github.com/celery/celery) from 5.3.6 to 5.4.0.
- [Release notes](https://github.com/celery/celery/releases)
- [Changelog](https://github.com/celery/celery/blob/main/Changelog.rst)
- [Commits](celery/celery@v5.3.6...v5.4.0)

---
updated-dependencies:
- dependency-name: celery
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements/base.txt

@@ -5,7 +5,7 @@ argon2-cffi==23.1.0  # https://github.com/hynek/argon2_cffi
 whitenoise==6.6.0  # https://github.com/evansd/whitenoise
 redis==5.0.3  # https://github.com/redis/redis-py
 hiredis==2.3.2  # https://github.com/redis/hiredis-py
-celery==5.3.6  # pyup: < 6.0  # https://github.com/celery/celery
+celery==5.4.0  # pyup: < 6.0  # https://github.com/celery/celery
 django-celery-beat==2.6.0  # https://github.com/celery/django-celery-beat
 flower==2.0.1  # https://github.com/mher/flower