Change ghc version to the last supported one

Author: nigosto

.github/workflows/project.yaml

@@ -18,7 +18,7 @@ jobs:
     - uses: actions/checkout@v4
     - uses: actions/setup-haskell@v1
       with:
-        ghc-version: '9.4.7'
+        ghc-version: '8.10.3'
         cabal-version: '2.4'
 
     - name: Cache