Bump redis from 3.5.3 to 6.4.0

Bumps [redis](https://github.com/redis/redis-py) from 3.5.3 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@3.5.3...v6.4.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements/production.txt

@@ -2,7 +2,7 @@
 certifi==2021.10.8
 django-redis-cache==3.0.1
 raven==6.10.0
-redis==3.5.3
+redis==6.4.0
 gunicorn==20.1.0
 hiredis==2.0.0
 sentry-sdk==1.5.12