Bump octicons_helper from 17.7.0 to 17.8.0
Bump octicons_helper from 17.7.0 to 17.8.0

Bumps [octicons_helper](https://github.com/primer/octicons) from 17.7.0 to 17.8.0.
- [Release notes](https://github.com/primer/octicons/releases)
- [Changelog](https://github.com/primer/octicons/blob/main/CHANGELOG.md)
- [Commits](https://github.com/primer/octicons/compare/v17.7.0...v17.8.0)

---
updated-dependencies:
- dependency-name: octicons_helper
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
alphagov/release,alphagov/release,alphagov/release