Don't use deprecated haskell/actions/setup

Author: jhrcek

.github/workflows/cabal.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
-    - uses: haskell/actions/setup@v2
+    - uses: haskell-actions/setup@v2
       name: Setup Haskell Cabal
       with:
         ghc-version: ${{ matrix.ghc }}