Fix duplicate dep in rabbitmq_auth_backend_oauth2

Author: Loïc Hoguin

deps/rabbitmq_auth_backend_oauth2/Makefile

@@ -6,7 +6,7 @@ BUILD_WITHOUT_QUIC=1
 export BUILD_WITHOUT_QUIC
 
 LOCAL_DEPS = inets public_key
-BUILD_DEPS = rabbit_common oauth2_client
+BUILD_DEPS = rabbit_common
 DEPS = rabbit cowlib jose base64url oauth2_client
 TEST_DEPS = cowboy rabbitmq_web_dispatch rabbitmq_ct_helpers rabbitmq_ct_client_helpers amqp_client rabbitmq_mqtt emqtt