Bump rubocop from 0.59.2 to 0.60.0 (#9135)

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.59.2 to 0.60.0.
- [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/v0.59.2...v0.60.0)

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

Gemfile

@@ -126,7 +126,7 @@ group :development do
   gem 'letter_opener', '~> 1.4'
   gem 'letter_opener_web', '~> 1.3'
   gem 'memory_profiler'
-  gem 'rubocop', '~> 0.59', require: false
+  gem 'rubocop', '~> 0.60', require: false
   gem 'brakeman', '~> 4.3', require: false
   gem 'bundler-audit', '~> 0.6', require: false
   gem 'scss_lint', '~> 0.57', require: false