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

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

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

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

.github/workflows/ci.yml

@@ -148,10 +148,10 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
-#      - uses: actions/download-artifact@v3
+#      - uses: actions/download-artifact@v4
 #        with:
 #          name: go-coverage-report
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: mr-coverage-report
       - run: cat lcov.info