Fixed a flaky windows test (#1500)

Author: adityawasudeo

tests/test_kernel.py

@@ -203,7 +203,7 @@ def parent_target():
 
         received = 0
         while received < iterations:
-            msg = kc.get_iopub_msg(timeout=interval * 2)
+            msg = kc.get_iopub_msg(timeout=interval * 10)
             if msg["msg_type"] != "stream":
                 continue
             content = msg["content"]
@@ -235,7 +235,7 @@ async def async_task():
 
         received = 0
         while received < iterations:
-            msg = kc.get_iopub_msg(timeout=interval * 2)
+            msg = kc.get_iopub_msg(timeout=interval * 10)
             if msg["msg_type"] != "stream":
                 continue
             content = msg["content"]