Fix CI workflow

Author: alonsodomin

Diff for: .github/workflows/ci.yaml

@@ -7,7 +7,7 @@ jobs:
     name: Build
     strategy:
       matrix:
-        ghc: ['8.10.4']
+        ghc: ['8.10']
         stack: ['latest']
         os: [ubuntu-latest, macOS-latest, windows-latest]
     runs-on: ${{ matrix.os }}
@@ -20,5 +20,6 @@ jobs:
           # cabal-version: 'latest'. Omitted, but defalts to 'latest'
           enable-stack: true
           stack-version: ${{ matrix.stack }}
+          stack-setup-ghc: true
 
       - run: stack build