Update redis requirement from <5.1.2,>=4.3 to >=4.3,<5.2.1

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@v4.3.0...v5.2.0)

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

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

requirements.txt

@@ -34,7 +34,7 @@ psycopg[binary]>=3.1.8,<=3.2.3
 pyparsing>=3.1.0,<=3.2.0
 python-gnupg>=0.5,<=0.5.3
 PyYAML>=5.1.1,<=6.0.2
-redis>=4.3,<5.1.2
+redis>=4.3,<5.2.1
 tablib<3.6.0
 url-normalize>=1.4.3,<=1.4.3
 uuid6>=2023.5.2,<=2024.7.10