Merge pull request #25166 from gnossen/python_cb_interop_image

Update Server Image for Python xDS Interop Tests

tools/internal_ci/linux/grpc_xds_bazel_python_test_in_docker.sh

@@ -66,7 +66,7 @@ GRPC_VERBOSITY=debug GRPC_TRACE=xds_client,xds_resolver,xds_cluster_manager_lb,c
   tools/run_tests/run_xds_tests.py \
     --test_case="all,path_matching,header_matching,circuit_breaking" \
     --project_id=grpc-testing \
-    --source_image=projects/grpc-testing/global/images/xds-test-server-2 \
+    --source_image=projects/grpc-testing/global/images/xds-test-server-3 \
     --path_to_server_binary=/java_server/grpc-java/interop-testing/build/install/grpc-interop-testing/bin/xds-test-server \
     --gcp_suffix=$(date '+%s') \
     --verbose \