Migrate to haskell-actions/setup

As of 2023-09-09, haskell/action/setup is no longer maintained.

The comment

  # latest is mandatory for cabal-testsuite, see #8133

is removed; as the validate job was already fixing a version of cabal-install.

(cherry picked from commit 8e09697)

# Conflicts:
#	.github/workflows/validate.yml

.github/workflows/validate.yml

@@ -57,17 +57,7 @@ jobs:
 
       - uses: actions/checkout@v3
 
-      # See https://github.com/haskell/cabal/pull/8739
-      - name: Sudo chmod to permit ghcup to update its cache
-        run: |
-          if [[ "${{ runner.os }}" == "Linux" ]]; then
-            sudo ls -lah /usr/local/.ghcup/cache
-            sudo mkdir -p /usr/local/.ghcup/cache
-            sudo ls -lah /usr/local/.ghcup/cache
-            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: ${{ matrix.ghc }}
@@ -356,11 +346,12 @@ jobs:
           apt-get update
           apt-get install -y ghc-${{ matrix.extra-ghc }}-dyn
 
-      - uses: haskell/actions/setup@v2
+      - uses: haskell-actions/setup@v2
         id: setup-haskell
         with:
           ghc-version: ${{ matrix.ghc }}
-          cabal-version: '3.10.1.0'
+          # Make sure this bindist works in this old environment
+          cabal-version: 3.10.1.0
 
       # As we are reusing the cached build dir from the previous step
       # the generated artifacts are available here,
@@ -415,7 +406,7 @@ 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 }}