Bump actions/cache from 3 to 4 (#291)

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

.github/workflows/update.yml

@@ -25,7 +25,7 @@ jobs:
           format: YYYY-ww # 2022-01 to 2022-52 for eg
 
       - name: Cache fetched repositories
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.cache
           # The cache is reset on the first build of every week this way. If you wish to reset the cache manually,