Use maintaned action

Author: alonsodomin

.github/workflows/ci.yaml

@@ -14,7 +14,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - uses: actions/setup-haskell@v1.1
+      - uses: haskell/actions/setup@v1
         with:
           ghc-version: ${{ matrix.ghc }}
           # cabal-version: 'latest'. Omitted, but defalts to 'latest'