fix: update actions/upload-artifact to v4 as v3 is disabled

The use of v3 now triggers an error with this action.

Author: sgaist

.github/workflows/test-pull-request.yml

@@ -80,7 +80,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
     - name: Upload Artifact
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: event-payload
         path: ${{ github.event_path }}