Bump redis from 2.10.6 to 4.4.4 in /services/phame-app

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] <[email protected]>

Author: dependabot[bot]

services/phame-app/requirements.txt

@@ -6,6 +6,6 @@ celery==5.2.2
 flower==1.2.0
 kombu==4.2.0
 pytz==2018.3
-redis==2.10.6
+redis==4.4.4
 tornado==5.0.2
 vine==1.1.4