Bump bundler-audit from 0.6.0 to 0.6.1
Bump bundler-audit from 0.6.0 to 0.6.1

Bumps [bundler-audit](https://github.com/postmodern/bundler-audit) from 0.6.0 to 0.6.1.
- [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/v0.6.0...v0.6.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
mitre-cyber-academy/ctf-scoreboard,mitre-cyber-academy/ctf-scoreboard,mitre-cyber-academy/registration-app,mitre-cyber-academy/ctf-scoreboard,mitre-cyber-academy/registration-app,mitre-cyber-academy/ctf-scoreboard,mitre-cyber-academy/registration-app