Optimistically try to bypass timeout error when waiting for scheduler

distributed/tests/test_jupyter.py

@@ -133,8 +133,14 @@ def test_shutsdown_cleanly(loop):
         )
 
         # wait until scheduler is running
-        with Client(f"127.0.0.1:{port}", loop=loop):
-            pass
+        try:
+            with Client(f"127.0.0.1:{port}", loop=loop):
+                pass
+        except OSError as exc:
+            if "Timed out" in str(exc):
+                pass  # Sporadic timeout error (raised as OSError) when trying to connect
+            else:
+                raise
 
         with requests.Session() as session:
             session.get("http://127.0.0.1:8787/jupyter/lab").raise_for_status()