Merge remote-tracking branch 'origin/master'

Author: thma

.github/workflows/haskell.yml

@@ -11,9 +11,9 @@ jobs:
     - uses: actions/checkout@v2
     - uses: actions/setup-haskell@v1
       with:
-        ghc-version: '8.6.5'
+        ghc-version: '8.10.1'
         cabal-version: '3.0'
-        stack: '2.2.0' 
+        stack-version: '2.3.3' 
     - name: Build
       run: stack install
     - name: Run tests