from_url() typed incorrectly

[fennb]

Version: 5.0.1

Platform: All

Description: A recent commit that (very helpfully) introduced type hints to the library has an incorrect return type defined for Redis.from_url(). Notably, it declares a return type of None rather than Redis as it should be.

This was introduced in this commit: https://github.com/redis/redis-py/pull/2952/files#diff-3161b005adfa1f5266a9736bffb5ede9d14e2ab40937cb241bc16ca5647df79dR97

[mrtolkien]

Same issue here, this is pretty critical imo because it breaks any CI running linting with redis.

[dvora-h]

Fixed in #2963