Bump redis from 2.10.6 to 4.4.4 in /releases/dogwood/3/fun

Bumps [redis](https://github.com/redis/redis-py) from 2.10.6 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@2.10.6...v4.4.4)

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

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

releases/dogwood/3/fun/requirements.txt

@@ -29,7 +29,7 @@ djangorestframework-simplejwt==3.3
 # Add Gelf support for logging
 djehouty==0.1.5
 raven==6.9.0
-redis==2.10.6
+redis==4.4.4
 # Upgrade requests and urllib3 to prevent SSL certificate validation failure
 # (we should use pyOpenSSL instead of the local openssl library). For reference, see:
 # https://urllib3.readthedocs.io/en/latest/user-guide.html#ssl-py2