Set minimum Redis version for GitLab to 6.0
What does this MR do and why?
With the vendored Sidekiq with Redis 6.0 compatibility changes introduced to gitlab on master (!142986 (merged)) and 16-8-stable-ee (!143526 (merged)), GitLab Rails will work with Redis 6.0 when launching sidekiq workers.
This MR updates the system check for Redis to require Redis 6.0 to be the minimum version (!142881 (merged)). However, we could keep the recommended version to be 6.2.x.
It also updates 2 document changes:
issue: #439418 (comment 1746532656)
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