Bump actions/cache from 3 to 4

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](https://github.com/actions/cache/compare/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>

.github/workflows/ci.yml

@@ -55,7 +55,7 @@ jobs:
         with:
           extra_nix_config: |
             accept-flake-config = true
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: |
             ~/.ghc-wasm/.cabal/store
@@ -132,7 +132,7 @@ jobs:
         with:
           enable-stack: true
           stack-no-global: true
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: ~/.stack
           key: stack-${{ hashFiles('stack.yaml', 'ormolu.cabal') }}