cabal-install-solver: fix pkgconf 1.9 --modversion regression (backport #9391)

[mergify]

This is an automatic backport of pull request #9391 done by Mergify.
Cherry-pick of 3832bea has failed:

On branch mergify/bp/3.10/pr-9391
Your branch is up to date with 'origin/3.10'.

You are currently cherry-picking commit 3832beaf5.
  (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:
	new file:   changelog.d/pr-9391

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   cabal-install-solver/src/Distribution/Solver/Types/PkgConfigDb.hs

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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[jasagredo]

Rebase conflicts are resolved now

[jasagredo]

@mergify refresh

[mergify]

refresh

✅ Pull request refreshed

[Mikolaj]

I compared with the original PR and they are quire different as chunks of text, but fortunately mostly in that a comment from another PR was pulled in the backport, which is probably for the best. Please feel free to set a merge label.

[grayjay]

It looks like this PR contains part of the logic of #9134. Was #9134 intended to be backported, too? It introduced the bug that was fixed by #9391, so if #9134 doesn't need to be backported, then #9391 shouldn't need to be backported either.