Migrate to haskell-actions/setup

As of 2023-09-09, haskell/action/setup is no longer maintained.

Author: andreabedini

.github/workflows/validate.yml

@@ -79,7 +79,7 @@ jobs:
           key: ${{ runner.os }}-${{ matrix.ghc }}-${{ github.sha }}
           restore-keys: ${{ runner.os }}-${{ matrix.ghc }}-
 
-      - uses: haskell/actions/setup@v2
+      - uses: haskell-actions/setup@v2
         id: setup-haskell
         with:
           ghc-version: ${{ matrix.ghc }}
@@ -219,7 +219,7 @@ jobs:
           apt-get update
           apt-get install -y ghc-${{ matrix.extra-ghc }}-dyn
 
-      - uses: haskell/actions/setup@v2
+      - uses: haskell-actions/setup@v2
         id: setup-haskell
         with:
           ghc-version: ${{ matrix.ghc }}
@@ -272,7 +272,7 @@ jobs:
             sudo chown -R $USER /usr/local/.ghcup
             sudo chmod -R 777 /usr/local/.ghcup
           fi
-      - uses: haskell/actions/setup@v2
+      - uses: haskell-actions/setup@v2
         id: setup-haskell
         with:
           ghc-version: ${{ matrix.ghc }}