Bump RabbitMQ to 3.7.8 for CI

Author: acogoluegnes

bin/before_build.sh

@@ -1,8 +1,8 @@
 #!/bin/sh
 
-wget https://github.com/rabbitmq/rabbitmq-server/releases/download/v3.7.7/rabbitmq-server-generic-unix-3.7.7.tar.xz
-tar xf rabbitmq-server-generic-unix-3.7.7.tar.xz
-mv rabbitmq_server-3.7.7 rabbitmq
+wget https://github.com/rabbitmq/rabbitmq-server/releases/download/v3.7.8/rabbitmq-server-generic-unix-3.7.8.tar.xz
+tar xf rabbitmq-server-generic-unix-3.7.8.tar.xz
+mv rabbitmq_server-3.7.8 rabbitmq
 
 rabbitmq/sbin/rabbitmq-server -detached