Bump brakeman from 3.7.0 to 3.7.1
Bump brakeman from 3.7.0 to 3.7.1

Bumps [brakeman](https://github.com/presidentbeef/brakeman) from 3.7.0 to 3.7.1.
- [Release notes](https://github.com/presidentbeef/brakeman/releases/tag/v3.7.1)
- [Changelog](https://github.com/presidentbeef/brakeman/blob/master/CHANGES)
- [Commits](https://github.com/presidentbeef/brakeman/compare/v3.7.0...v3.7.1)
ministryofjustice/prison-visits-public,ministryofjustice/prison-visits-public,ministryofjustice/prison-visits-public,ministryofjustice/prison-visits-public