Drop Redis 5 support and use Redis 7 in CI

Stan Hurequested to merge
sh-drop-redis-5-support into master

What does this MR do and why?

We now make use of some commands only available in Redis 6 (#378809 (closed)) and deprecated support in GitLab 15.3. Let's drop Redis 5 and test against Redis 7.

Relates to #331468 (closed)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Stan Hu

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