Revert channels-redis bump for Redis 4 support

Last version with Redis <5 compatibility was 2.4.2 : https://github.com/django/channels_redis/blob/master/CHANGELOG.txt#L20

changed the description

assigned to @babadie and unassigned @erwanrouchet

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added 3 commits

• c266e12d...86fd1c79 - 2 commits from branch master
• 4509eed0 - Revert channels-redis bump for Redis 4 support

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enabled an automatic merge when the pipeline for 4509eed0 succeeds

mentioned in commit 5776aa68

merged