Core: downgrade websockets and minor fixes (#4166)

* Core: downgrade websockets to 13.x

14.x currently doesn't work for MultiServer.
14.x is not supported with py3.8, so updating to 14.x should be scheduled for AP 0.6.0.

* CI: 5min timeout for hosting test

* MultiServer: properly shutdown even if ctx is invalid

* CI: increase hosting test timeout to 10min

this is 4x expected time, just to be safe.

MultiServer.py

@@ -1960,8 +1960,10 @@ class ServerCommandProcessor(CommonCommandProcessor):
 
     def _cmd_exit(self) -> bool:
         """Shutdown the server"""
-        self.ctx.server.ws_server.close()
-        self.ctx.exit_event.set()
+        try:
+            self.ctx.server.ws_server.close()
+        finally:
+            self.ctx.exit_event.set()
         return True
 
     @mark_raw