chore(deps): bump redis from 5.0.3 to 5.0.4 in /backend/requirements

Bumps [redis](https://github.com/redis/redis-py) from 5.0.3 to 5.0.4.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@v5.0.3...v5.0.4)

---
updated-dependencies:
- dependency-name: redis
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

backend/requirements/base.txt

@@ -5,7 +5,7 @@ pytz==2024.1  # https://github.com/stub42/pytz
 Pillow==10.3.0  # https://github.com/python-pillow/Pillow
 argon2-cffi==23.1.0  # https://github.com/hynek/argon2_cffi
 hiredis==2.3.2  # https://github.com/redis/hiredis-py
-redis==5.0.3  # https://github.com/redis/redis-py
+redis==5.0.4  # https://github.com/redis/redis-py
 celery==5.3.6  # pyup: < 6.0  # https://github.com/celery/celery
 flower==2.0.1  # https://github.com/mher/flower