Upgrade from deprecated haskell/actions/setup to haskell-actions/setup in benchmarks (#4068)

Author: jhrcek

.github/workflows/bench.yml

@@ -121,7 +121,7 @@ jobs:
         example: ['cabal', 'lsp-types']
 
     steps:
-    - uses: haskell/actions/setup@v2.4.7
+    - uses: haskell-actions/setup@v2.6.1
       with:
         ghc-version  : ${{ matrix.ghc   }}
         cabal-version: ${{ matrix.cabal }}