Why does Kombu insist on redis-py < 6.0 ?

[coredumperror]

The requirements/extras/redis.txt file specifies that kombu[redis] install this:

redis>=4.5.2,!=4.5.5,!=5.0.2,<6

I understand why the low-end and version-specific restrictions are in there, but why the <6?

I ask because those two characters force projects that want the latest celery[redis] to use an old version of redis-py, because celery[redis] now specifies its redis version via kombu[redis]. This makes it impossible to use redis 6.x with anything later than Celery 5.3.1, which is when Celery started basing its redis dependency on kombu's.

This causes very confusing behavior, as updating Celery to 5.5.3 downgrades redis-py to 5.2.1, yet forcing redis-py to 6.x downgrades celery to 5.3.1.

[auvipy]

we did not have py redis 6 support in our projects, if py redis 6 works well then we can update the dependencies

[auvipy]

related #2377