Update dependency channels-redis to v3.4.0 (develop)

This MR contains the following updates:

Package	Type	Update	Change
channels-redis	dependencies	minor	==3.3.1 -> ==3.4.0

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Release Notes

django/channels_redis

v3.4.0

Compare Source

• Dropped support for Python 3.6, which is now end-of-life, and added CI testing for Python 3.10. (#​301).

• Added serialize and deserialize hooks to RedisPubSubChannelLayer (#​281).

• Fixed iscoroutine check for pubsub proxied methods (#​297).

• Fix workers support when using Redis PubSub layer (#​298)

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