Update upload-artifact action to version 4 in OnPush workflow

Author: Antoine

.github/workflows/OnPush.yml

@@ -31,7 +31,7 @@ jobs:
       run: make tests
 
     - name: Upload test reports
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: test-reports
         path: tests_reports/