Update bunny requirement from < 2.12, >= 2.9 to >= 2.9, < 2.13
Update bunny requirement from < 2.12, >= 2.9 to >= 2.9, < 2.13

Updates the requirements on [bunny](https://github.com/ruby-amqp/bunny) to permit the latest version.
- [Release notes](https://github.com/ruby-amqp/bunny/releases)
- [Changelog](https://github.com/ruby-amqp/bunny/blob/master/ChangeLog.md)
- [Commits](https://github.com/ruby-amqp/bunny/commits/2.12.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
Fatsoma/hutch,Fatsoma/hutch,gocardless/hutch,Fatsoma/hutch,gocardless/hutch,gocardless/hutch