Migrate to clients test image

[uglide]

This change introduces a new test matrix based on Redis versions 7.4, 7.2, and 6.2. The new workflows are Redis 8.0 ready, but 8.0 should be added to test matrix as a separate PR to address broken tests and fix incompatibility with 8.0. By default, we start integration jobs only to test a change on all Redis versions with Python 3.8 and 3.12. On success, all other compatibility test runs kick in to do full validation.

[uglide]

CC: @ggivo

[akx]

@uglide This seems to have introduced errors like /home/runner/work/_temp/9be3a23c-94d1-45cf-8346-a760182dff2c.sh: line 14: ((: < 7 : syntax error: operand expected (error token is "< 7 ") in subsequent CI runs.

[uglide]

Thanks @akx! Unfortunately, I've missed your message here. Still, late is better than never... so here is the fix https://github.com/redis/redis-py/pull/3642