Change specVersion to have CabalSpecVersion type
- We had to add gpdScannedVersion to permit solver to report about too new packages in the index. https://github.com/haskell/cabal/issues/6652 - It's hard to track what happening with Setup interface selection in ProjectPlanning. https://github.com/haskell/cabal/issues/6651 would help to make sense of it.
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