Avoid dodgy Rep (..) import in Cabal-syntax (backport #9071)

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This is an automatic backport of pull request #9071 done by Mergify.
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On branch mergify/bp/3.10/pr-9071
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	both modified:   Cabal-syntax/src/Distribution/Compat/Prelude.hs

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

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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