Upgrade Channels and various other Python components

Our Channels 1.x dependency was locking down many libraries.
Upgraded to the latest 2.x branch which freed up upgrading things
like redis and rq.
3 jobs for upgrade-channels in 18 minutes and 27 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Lint
passed #6348
lint

00:04:29

 
  Test Backend
passed #6349
test_backend

00:08:33

 
  Test Frontend
passed #6350
test_frontend_unit

00:05:25