Bump actions/cache from 3 to 4 (#8)

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/haskell.yml

@@ -34,7 +34,7 @@ jobs:
         cabal build --dry-run
 
     - name: Restore cached dependencies
-      uses: actions/cache/restore@v3
+      uses: actions/cache/restore@v4
       id: cache
       env:
         key: ${{ runner.os }}-ghc-${{ steps.setup.outputs.ghc-version }}-cabal-${{ steps.setup.outputs.cabal-version }}
@@ -48,7 +48,7 @@ jobs:
       run: cabal build all --only-dependencies
 
     - name: Save cached dependencies
-      uses: actions/cache/save@v3
+      uses: actions/cache/save@v4
       if: steps.cache.outputs.cache-hit != 'true'
       with:
         path: ${{ steps.setup.outputs.cabal-store }}