Bump rabbitmq_exporter from 0.26.0 to 0.28.0
Bump rabbitmq_exporter from 0.26.0 to 0.28.0

Descriptions of the changes in each release:
- https://github.com/kbudde/rabbitmq_exporter/releases/tag/v0.27.0
- https://github.com/kbudde/rabbitmq_exporter/releases/tag/v0.27.1
- https://github.com/kbudde/rabbitmq_exporter/releases/tag/v0.28.0

lest/prometheus-rpm,lest/prometheus-rpm