Correct a type spec of amqqueue:internal_owner/1

(cherry picked from commit 77ada36158f8805a1e2c854459033deda3a4fe28)

Author: michaelklishin

deps/rabbit/src/amqqueue.erl

@@ -512,7 +512,7 @@ is_quorum(Queue) ->
 is_internal(#amqqueue{options = #{internal := true}}) -> true;
 is_internal(#amqqueue{}) -> false.
 
--spec internal_owner(amqqueue()) -> #resource{}.
+-spec internal_owner(amqqueue()) -> rabbit_types:option(#resource{}).
 
 internal_owner(#amqqueue{options = #{internal := true,
                                      internal_owner := IOwner}}) ->