Bump bundler-audit from 0.7.0.1 to 0.8.0 (#15877)

Bump bundler-audit from 0.7.0.1 to 0.8.0 (#15877)

Bumps [bundler-audit](https://github.com/postmodern/bundler-audit) from 0.7.0.1 to 0.8.0.
- [Release notes](https://github.com/postmodern/bundler-audit/releases)
- [Changelog](https://github.com/rubysec/bundler-audit/blob/master/ChangeLog.md)
- [Commits](https://github.com/postmodern/bundler-audit/compare/v0.7.0.1...v0.8.0)

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