Upgrade upload/artifacts action to v4

Author: cmaglie

.github/workflows/compile-examples.yml

@@ -226,7 +226,7 @@ jobs:
 
       - name: Save memory usage change report as artifact
         if: github.event_name == 'pull_request'
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           path: ${{ env.SKETCHES_REPORTS_PATH }}
           name: ${{ env.SKETCHES_REPORTS_PATH }}