Update rubocop-packaging requirement from ~> 0.1.1 to ~> 0.3.0
Update rubocop-packaging requirement from ~> 0.1.1 to ~> 0.3.0

Updates the requirements on [rubocop-packaging](https://github.com/utkarsh2102/rubocop-packaging) to permit the latest version.
- [Release notes](https://github.com/utkarsh2102/rubocop-packaging/releases)
- [Commits](https://github.com/utkarsh2102/rubocop-packaging/compare/v0.1.1...v0.3.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
arnau/ISO8601