Fix Cabal store location in CI cache

Newer versions of Cabal no longer use ~/.cabal/
unless it's already present (XDG).

.github/actions/cabal-cache/action.yml

@@ -5,7 +5,7 @@ runs:
     - name: Cache dependencies
       uses: actions/cache@v3
       with:
-        path: ~/.cabal/store
+        path: ~/.local/state/cabal/store/
         key: cabal-${{ runner.os }}-${{ hashFiles('cabal.project.freeze') }}
         restore-keys: |
           cabal-${{ runner.os }}