Unbreak cabal validate nonsense

Author: hasufell

.github/workflows/validate.yml

@@ -211,13 +211,6 @@ jobs:
 
       - uses: actions/checkout@v4
 
-      # See https://github.com/haskell/cabal/blob/master/CONTRIBUTING.md#hackage-revisions
-      - name: Manually supplied constraints/allow-newer
-        if: github.event_name == 'workflow_dispatch'
-        run: |
-          echo "allow-newer: ${ALLOWNEWER}"  >> cabal.validate.project
-          echo "constraints: ${CONSTRAINTS}" >> cabal.validate.project
-
       - uses: haskell-actions/setup@v2
         id: setup-haskell
         with: