play: increase timeout

* Workflows can take substantially longer than 20 seconds to startup.

cylc/uiserver/resolvers.py

@@ -314,7 +314,7 @@ async def play(
                     stderr=PIPE,
                     text=True
                 )
-                ret_code = proc.wait(timeout=20)
+                ret_code = proc.wait(timeout=120)
 
                 if ret_code:
                     # command failed