Bump actions/upload-artifact from 2.2.3 to 2.2.4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2.2.3 to 2.2.4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v2.2.3...v2.2.4)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ruby.yml

@@ -79,7 +79,7 @@ jobs:
     - name: Save coverage
       run: ./cc-test-reporter format-coverage --output coverage/codeclimate.${{ matrix.ruby }}.json
 
-    - uses: actions/upload-artifact@v2.2.3
+    - uses: actions/upload-artifact@v2.2.4
       with:
         name: coverage-${{ matrix.ruby }}
         path: coverage/codeclimate.${{ matrix.ruby }}.json