v1.18: quic: delay calling set_max_concurrent_uni_streams/set_receive_window (backport of #904) #968
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Delay calling connection.set_max_concurrent_uni_streams() and connection.set_receive_window() to when we know we've accepted the connection. Avoids a short window where the peer could start transmitting even if we're going to drop the connection, and avoids taking the connection mutex and waking a task.
This is an automatic backport of pull request #904 done by Mergify.