Pin linter versions in CI

Author: uhbif19

.github/workflows/haskell-ci.yml

@@ -40,8 +40,8 @@ jobs:
     - name: Install and run linters
       shell: devx {0}
       run: |
-        cabal install --overwrite-policy=always cabal-fmt
-        cabal install --overwrite-policy=always fourmolu
+        cabal install --overwrite-policy=always cabal-fmt==0.1.12
+        cabal install --overwrite-policy=always fourmolu==0.16.0.0
         /home/runner/.cabal-devx/bin/cabal-fmt --check cem-script.cabal
         /home/runner/.cabal-devx/bin/fourmolu --mode check .
     - name: Cabal build and test