Fix MQTT test flake management_plugin_connection (backport #12689)#12692

ansd merged 1 commit intov4.0.xrabbitmq/rabbitmq-server:v4.0.xfrom

mergify/bp/v4.0.x/pr-12689rabbitmq/rabbitmq-server:mergify/bp/v4.0.x/pr-12689Copy head branch name to clipboard