sdks/python: mark milvus itests with require_docker_in_docker marker

Author: mohamedawnallah

sdks/python/apache_beam/ml/rag/ingestion/milvus_search_it_test.py

@@ -153,7 +153,7 @@ def drop_collection(client: MilvusClient, collection_name: str):
     pass
 
 
-@pytest.mark.uses_testcontainer
+@pytest.mark.require_docker_in_docker
 @unittest.skipUnless(
     platform.system() == "Linux",
     "Test runs only on Linux due to lack of support, as yet, for nested "