Migrate to haskell-actions/setup (backport #9463)

[mergify]

This is an automatic backport of pull request #9463 done by Mergify.
Cherry-pick of 8e09697 has failed:

On branch mergify/bp/3.10/pr-9463
Your branch is up to date with 'origin/3.10'.

You are currently cherry-picking commit 8e0969708.
  (fix conflicts and run "git cherry-pick --continue")
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  (use "git add <file>..." to mark resolution)
	both modified:   .github/workflows/validate.yml

no changes added to commit (use "git add" and/or "git commit -a")

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[jasagredo]

I have rebased this on top of 3.10 and fixed the rebase conflicts.

[jasagredo]

In fact I deleted a chunk by mistake, let me fix it

[Mikolaj]

Thank you!

[jasagredo]

@mergify merge

[mergify]

merge

❌ Sorry but I didn't understand the command. Please consult the commands documentation 📚.

[jasagredo]

Ah it was a label not a command 😅