fix: CI cache action version

Author: blackheaven

.github/workflows/haskell-ci.yml

@@ -45,7 +45,7 @@ jobs:
       - name: Freeze
         run: cabal freeze
       - name: Cache
-        uses: actions/cache@v4.0.2
+        uses: actions/cache@v4
         with:
           path: ${{ steps.setup-haskell.outputs.cabal-store }}
           key: ${{ runner.os }}-${{ matrix.ghc }}-${{ hashFiles('cabal.project.freeze') }}