Bump octicons_helper from 4.0.7 to 4.2.0
Bump octicons_helper from 4.0.7 to 4.2.0

Bumps [octicons_helper](https://github.com/primer/octicons) from 4.0.7 to 4.2.0.
- [Release notes](https://github.com/primer/octicons/releases?after=v4.2.1)
- [Changelog](https://github.com/primer/octicons/blob/master/CHANGELOG.md)
- [Commits](https://github.com/primer/octicons/compare/octicons_helper@4.0.7...v4.2.0)
ossfriday/ossfriday,ossfriday/ossfriday,ossfriday/ossfriday,ossfriday/ossfriday