Bump redis from 2.10.6 to 4.3.3

Bumps [redis](https://github.com/redis/redis-py) from 2.10.6 to 4.3.3.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](https://github.com/redis/redis-py/compare/2.10.6...v4.3.3)

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

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

requirements.txt

@@ -3,5 +3,5 @@ Flask==2.1.2
 itsdangerous==0.24
 Jinja2==3.1.2
 MarkupSafe==1.1.1
-redis==2.10.6
+redis==4.3.3
 Werkzeug==2.1.2