Update cabal.yml

Author: goodlyrottenapple

.github/workflows/cabal.yml

@@ -28,7 +28,7 @@ jobs:
       - uses: actions/checkout@v2
         with:
           submodules: true
-      - uses: haskell/actions/setup@v1
+      - uses: haskell/actions/setup@v2
         id: setup-haskell-cabal
         with:
           ghc-version: ${{ matrix.plan.ghc }}