fix(deps): update gavel requirement from 8.0.3 to 8.0.4
fix(deps): update gavel requirement from 8.0.3 to 8.0.4

Updates the requirements on [gavel](https://github.com/apiaryio/gavel.js) to permit the latest version.
- [Release notes](https://github.com/apiaryio/gavel.js/releases)
- [Commits](https://github.com/apiaryio/gavel.js/compare/v8.0.3...v8.0.4)

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