Update Rubocop version (#608)

* Update rubocop requirement from ~> 0.46.0 to ~> 0.65.0

Updates the requirements on [rubocop](https://github.com/rubocop-hq/rubocop) to permit the latest version.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v0.46.0...v0.65.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* Regenerate .rubocop_todo.yml

Author: drwl