Use correct setup-haskell plugin.

Author: robinheghan

.github/workflows/build.yml

@@ -119,7 +119,7 @@ jobs:
           key: ghcup-${{ matrix.os }}-${{ env.ghc }}
 
       - id: setup-haskell
-        uses: haskell/actions/setup@v2
+        uses: haskell-actions/setup@v2
         with:
           ghc-version: ${{ env.ghc }}
           cabal-version: ${{ env.cabal }}