Bump bunny from 2.9.0 to 2.9.1
Bump bunny from 2.9.0 to 2.9.1

Bumps [bunny](https://github.com/ruby-amqp/bunny) from 2.9.0 to 2.9.1.
- [Changelog](https://github.com/ruby-amqp/bunny/blob/master/ChangeLog.md)
- [Commits](https://github.com/ruby-amqp/bunny/commits)
alphagov/publishing-api,alphagov/publishing-api