Makefile: remove dependency version enforcement

erlang.mk uses the branch name (v3.x.y) to correctly detect the
dependencies version.

Signed-off-by: Matteo Cafasso <[email protected]>

Author: noxdafox

Makefile

@@ -1,8 +1,6 @@
 PROJECT = rabbitmq_message_deduplication
 
 DEPS = rabbit_common rabbit
-override dep_rabbit_common = git https://github.com/rabbitmq/rabbitmq-common v3.7.x
-override dep_rabbit = git https://github.com/rabbitmq/rabbitmq-server v3.7.x
 TEST_DEPS = rabbitmq_ct_helpers rabbitmq_ct_client_helpers amqp_client
 
 DEP_PLUGINS = rabbit_common/mk/rabbitmq-plugin.mk