Update redis requirement (celery#2203)

Updates the requirements on [redis](https://github.com/redis/redis-py) to permit the latest version.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@v4.5.2...v5.2.1)

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

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requirements/extras/redis.txt

@@ -1 +1 @@
-redis>=4.5.2,!=4.5.5,!=5.0.2,<=5.2.0
+redis>=4.5.2,!=4.5.5,!=5.0.2,<=5.2.1