Apply redis sentinel connection closing patch to RedisClient
What does this MR do and why?
This MR applies the commit of redis-client gem to Gitlab until the fix is released. The fix for sentinel client connection termination will not be released anytime soon since v0.20.0 was cut only a few days ago.
We opt to monkeypatch over directly referencing the branch for robustness.
See gitlab-com/gl-infra/scalability#2867 (comment 1775478649)
This lets us apply the fix against redis-sidekiq specifically since it is mildly affected at the moment (gitlab-com/gl-infra/scalability#2754 (comment 1776420383)).
MR acceptance checklist
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How to set up and validate locally
The validation steps are described in https://github.com/redis-rb/redis-client/pull/176. We are effectively only adding this commit.
Numbered steps to set up and validate the change are strongly suggested.