add type annotations for adaptive/tests/test_notebook_integration.py

Author: basnijholt

adaptive/tests/test_notebook_integration.py

@@ -2,7 +2,7 @@
 import zmq
 
 
-def test_private_api_used_in_live_info():
+def test_private_api_used_in_live_info() -> None:
     """We are catching all errors in
     adaptive.notebook_integration.should_update
     so if ipykernel changed its API it would happen unnoticed."""