Revert "haskellPackages: stackage LTS 21.23 -> LTS 22.4"
This reverts commit 2e7f09c390.
Reason for revert: Due to all-cabal-hashes not updating, we can't at the
moment get a more up to date hackage database the normal way. Let's
revert to the old state, so we can keep working on what we have until a
more up to date snapshot is available.
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