CI: add GHC pre-release (backport #8754)

[mergify]

This is an automatic backport of pull request #8754 done by Mergify.
Cherry-pick of 91393b4 has failed:

On branch mergify/bp/3.10/pr-8754
Your branch is ahead of 'origin/3.10' by 1 commit.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 91393b4cc.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   .github/workflows/changelogs.yml
	modified:   .github/workflows/validate.yml

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   .github/workflows/quick-jobs.yml

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[Mikolaj]

We need better CI and better GHC 9.6 compatibility on the 3.10 branch, so this PR is needed.

[Mikolaj]

Let's wait until merging of #8804 resolves the conflict.

[Mikolaj]

@mergify rebase

[mergify]

rebase

❌ Base branch update has failed

Git reported the following error:

Rebasing (1/3)
Rebasing (2/3)
Auto-merging .github/workflows/quick-jobs.yml
CONFLICT (content): Merge conflict in .github/workflows/quick-jobs.yml
error: could not apply 2a685d114... CI: update actions/cache to v3
hint: Resolve all conflicts manually, mark them as resolved with
hint: "git add/rm <conflicted_files>", then run "git rebase --continue".
hint: You can instead skip this commit: run "git rebase --skip".
hint: To abort and get back to the state before "git rebase", run "git rebase --abort".
Could not apply 2a685d114... CI: update actions/cache to v3

err-code: A8685

[Mikolaj]

It seems mergify incorporated the conflicts into the initial shape of this branch and we can't remove them automatically, only manually. We also can't make another backport, either, which would now be clean. Perhaps I can make a copy of this branch, backport there and from there to here.

[Mikolaj]

Here's a hacked backport without the merge conflict. Let's move there. #8806

[Mikolaj]

It seems we can't fix this error until 3.10 is on Hackage, so let's close this obsolete PR.