Bump redis from 3.5.3 to 4.4.4

Bumps [redis](https://github.com/redis/redis-py) from 3.5.3 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@3.5.3...v4.4.4)

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

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

Author: dependabot[bot]

requirements.txt

@@ -15,7 +15,7 @@ prettyconf==2.1.0
 psycopg2-binary==2.7.5
 pyqrcode==1.2.1
 qr==0.6.0
-redis==3.5.3
+redis==4.4.4
 reportlab==3.5.32
 rq==1.8.1
 sendgrid==5.6.0