amqp10_client: Accept the {shutdown, _} exit reason is close_sent/3

[Why]
The clause above the new one in `close_sent/3` was already handling the
fact that the remote process could exit during the close "handshake".
But the remote process could terminate with `{shutdown, Reason}` in
addition to `shutdown`, where `Reason` is `delete` or `autodelete` for
instance.

[How]
We handle `{shutdown, _}` exactly as `shutdown`.

This was detected by frequent failures in CI.

Author: dumbbell

deps/amqp10_client/src/amqp10_client_connection.erl

@@ -352,6 +352,9 @@ close_sent(_EvtType, heartbeat, _Data) ->
 close_sent(_EvtType, {'EXIT', _Pid, shutdown}, _Data) ->
     %% monitored processes may exit during closure
     keep_state_and_data;
+close_sent(_EvtType, {'EXIT', _Pid, {shutdown, _}}, _Data) ->
+    %% monitored processes may exit during closure
+    keep_state_and_data;
 close_sent(_EvtType, {'DOWN', _Ref, process, ReaderPid, _Reason},
            #state{reader = ReaderPid}) ->
     %% if the reader exits we probably won't receive a close frame