Bump formtastic from 3.1.4 to 3.1.5
Bump formtastic from 3.1.4 to 3.1.5

Bumps [formtastic](https://github.com/justinfrench/formtastic) from 3.1.4 to 3.1.5.
- [Release notes](https://github.com/justinfrench/formtastic/releases)
- [Changelog](https://github.com/justinfrench/formtastic/blob/3.1.5/CHANGELOG)
- [Commits](https://github.com/justinfrench/formtastic/compare/3.1.4...3.1.5)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
sanger/asset_audits,sanger/asset_audits,sanger/asset_audits,sanger/asset_audits