Add username authenticating to the Redis hook

[shohamy7]

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Redis 6 and above introduced an option to authenticate with username in addition to password.
This PR aims to add support for this kind of authentication.
For more info, see here

[eladkal]

Redis 6 and above introduced an option to authenticate with username in addition to password.

We currently don't support redis 6 due to

airflow/airflow/providers/redis/provider.yaml

Lines 47 to 52 in dc228f9

	# We limit redis to <5.0.0 because of incompatibility with celery. Both Celery and Kombu limited it
	# and deferred fixing it for later, we should bump the limit once they do. Also !=4.5.5 matches celery
	# limits and prevents installing 4.5.5 which is broken.
	# https://github.com/celery/celery/pull/8442, https://github.com/celery/kombu/pull/1776
	- redis>=4.5.2,<5.0.0,!=4.5.5

If this is not relevant any more then we should update the provider.yaml if its still relevant than we need to handle the version support

[shohamy7]

I saw this limitation, but this limitation is for the redis client library.
It looks like the client library in the corresponding version can work with redis 6 as specified here

[eladkal]

It looks like the client library in the corresponding version can work with redis 6 as specified here

cool

[hussein-awala]

Is this new parameter compatible with the older versions?

[shohamy7]

@hussein-awala
Currently, in the redis provider we are requiring at least redis>=4.5.2 which support Redis versions 5.0 to 7.0.
From the redis docs, it looks like there is backward compatibility (when we are not specifying the username, the default user will be used).
From the redis client perspective, the username field was always there - we just did not set it (so it was None).
If you won't set the login field in the connection form - the username will be None and the RedisHook will act the same as before.
When using old Redis versions (e.g. 5.0) which not support username authentication - it should be handle by the redis client, as they are saying that it is supported :)

[hussein-awala]

Indeed, I just checked and found that the username argument is accepted in the old versions.