Update redis Docker tag to v8

[renovate]

This PR contains the following updates:

Package	Update	Change
redis	major	7 -> 8

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (f6c90da) to head (b8f40c9).
⚠️ Report is 19 commits behind head on master.

Additional details and impacted files

@@      Coverage Diff      @@
##   master   #351   +/-   ##
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[renovate]

Renovate Ignore Notification

Because you closed this PR without merging, Renovate will ignore this update. You will not get PRs for any future 8.x releases. But if you manually upgrade to 8.x then Renovate will re-enable minor and patch updates automatically.

If you accidentally closed this PR, or if you changed your mind: rename this PR to get a fresh replacement PR.