Update actions/upload-artifact action to v4

Author: renovate[bot]

.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@v3.1.3
+    - uses: actions/upload-artifact@v4.3.0
       with:
         name: coverage-${{ matrix.ruby }}
         path: coverage/codeclimate.${{ matrix.ruby }}.json