minor #43030 Pin ext-redis version in CI (derrabus)
minor #43030 Pin ext-redis version in CI (derrabus)

This PR was merged into the 4.4 branch.

Discussion
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Pin ext-redis version in CI

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | Backport from #43029
| License       | MIT
| Doc PR        | N/A

Commits
-------

ca347531f7 Pin ext-redis version in CI

d-ph/symfony,tucksaun/symfony,paradajozsef/symfony,xabbuh/symfony,derrabus/symfony,zerkms/symfony,stof/symfony,mpdude/symfony,damienalexandre/symfony,mpdude/symfony,HeahDude/symfony,d-ph/symfony,curry684/symfony,sgehrig/symfony,stof/symfony,ogizanagi/symfony,phramz/symfony,symfony/symfony,ro0NL/symfony,xabbuh/symfony,curry684/symfony,damienalexandre/symfony,symfony/symfony,HeahDude/symfony,hhamon/symfony,zerkms/symfony,ro0NL/symfony,phramz/symfony,symfony/symfony,mpdude/symfony,zerkms/symfony,hhamon/symfony,ogizanagi/symfony,phramz/symfony,stof/symfony,paradajozsef/symfony,xabbuh/symfony,damienalexandre/symfony,sgehrig/symfony,mpdude/symfony,ogizanagi/symfony,HeahDude/symfony,derrabus/symfony,HeahDude/symfony,ogizanagi/symfony,Tobion/symfony,paradajozsef/symfony,nicolas-grekas/symfony,nicolas-grekas/symfony,phramz/symfony,tucksaun/symfony,paradajozsef/symfony,curry684/symfony,symfony/symfony,sgehrig/symfony,hhamon/symfony,d-ph/symfony,derrabus/symfony,tucksaun/symfony,nicolas-grekas/symfony,Tobion/symfony,sgehrig/symfony,Tobion/symfony,zerkms/symfony,Tobion/symfony,derrabus/symfony,d-ph/symfony,hhamon/symfony,nicolas-grekas/symfony,stof/symfony,tucksaun/symfony,xabbuh/symfony,damienalexandre/symfony,curry684/symfony,ro0NL/symfony,ro0NL/symfony