CI: Bump actions/cache from 3 to 4 (#13897)

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>
Signed-off-by: Christian Brabandt <cb@256bit.org>

.github/workflows/ci.yml

@@ -483,7 +483,7 @@ jobs:
           echo %SODIUM_VER%>> urls.txt
 
       - name: Cache downloaded files
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: downloads
           key: ${{ runner.os }}-${{ matrix.arch }}-${{ hashFiles('urls.txt') }}