Bump redis from 2.10.2 to 4.4.4

Bumps [redis](https://github.com/redis/redis-py) from 2.10.2 to 4.4.4.
- [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/2.10.2...v4.4.4)

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

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

requirements.txt

@@ -1,6 +1,6 @@
 sleekxmpp==1.3.1
 eveapi==1.2.6
-redis==2.10.2
+redis==4.4.4
 requests==2.3.0
 humanize==0.5
 dnspython==1.11.1