UDP worker: conn.updateActivity() should be executed in Lock
#4910
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#4909 (comment)
because updateActivity() runs out of udpworker-Lock:
suppose exactly after 2 minutes of inactivity a packet is received from inbound, so it is possible we create a new-outbound-connection for that but we don't update udpconn-activity and close that.
this cause we ignore the active-outbound-connection by mistake and create new one for next-received-packet.
///
possible is possible, even with a very low probability.