[CI] Bump actions/cache from 3.3.1 to 4.0.0

Bumps [actions/cache](https://github.com/actions/cache) from 3.3.1 to 4.0.0.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3.3.1...v4.0.0)

---
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

@@ -60,7 +60,7 @@ jobs:
     - name: Freeze
       # Generates the `cabal.project.freeze` file.
       run: cabal freeze
-    - uses: actions/cache@v3.3.1
+    - uses: actions/cache@v4.0.0
       name: Cache ~/.cabal/store and ./dist-newstyle
       # TODO(2021-10-23): Do we really want the hash in the key?
       #   With nix-style builds it shouldn't be necessary (afaict),