fix(deps): 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](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>

.github/workflows/build.yml

@@ -71,7 +71,7 @@ jobs:
         sdk: ${{ matrix.DART_VERSION }}
 
     - name: Cache Dart Pub
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.pub-cache
         key: ${{ runner.os }}-dartpub-${{ hashFiles('**/pubspec.yaml') }}