Bump redis from 4.3.5 to 4.4.4 in /requirements

Bumps [redis](https://github.com/redis/redis-py) from 4.3.5 to 4.4.4.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@v4.3.5...v4.4.4)

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

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

requirements/base.txt

@@ -12,7 +12,7 @@ django-extensions==3.2.1
 djangorestframework==3.14.0
 django-redis==5.2.0
 hiredis==2.1.1
-redis==4.3.5
+redis==4.4.4
 Pillow==9.5.0
 icalendar==5.0.4
 dealer==2.1.0