Bump unicorn from 5.0.1 to 5.5.3
Bump unicorn from 5.0.1 to 5.5.3

Bumps [unicorn](https://yhbt.net/unicorn/) from 5.0.1 to 5.5.3.

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
chef/omnitruck,chef/opscode-omnitruck,chef/omnitruck,chef/opscode-omnitruck,chef/opscode-omnitruck,chef/omnitruck