build(deps): bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
         run: 'docker run --privileged --rm -v /var/cache:/var/cache -v "$(pwd)":/var/maru -i maruos/blueprints/ci -b debian -n buster-container -- -r buster -a arm64'
       - name: Upload generated rootfs tarball
         if: always()
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: buster-container-arm64
           path: out/*.tar.gz