Bump rubocop from 0.63.1 to 0.64.0 (#10006)

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.63.1 to 0.64.0.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop/compare/v0.63.1...v0.64.0

)

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