Bump redis from 6.2.0 to 6.4.0 (#12944)

Bumps [redis](https://github.com/redis/redis-py) from 6.2.0 to 6.4.0.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@v6.2.0...v6.4.0)

---
updated-dependencies:
- dependency-name: redis
  dependency-version: 6.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -34,7 +34,7 @@ Pillow==11.3.0  # required by django-imagekit
 psycopg[c]==3.2.9
 cryptography==45.0.5
 python-dateutil==2.9.0.post0
-redis==6.2.0
+redis==6.4.0
 requests==2.32.4
 sqlalchemy==2.0.42  # Required by Celery broker transport
 urllib3==2.5.0