Update rubocop requirement from 1.69.2 to 1.87.0

Updates the requirements on [rubocop](https://github.com/rubocop/rubocop) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.69.2...v1.87.0)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-version: 1.87.0
  dependency-type: direct:development
...

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

Author: dependabot[bot]

Gemfile

@@ -49,7 +49,7 @@ group :test, :development do
   gem 'bundler', '>= 1', '< 3'
   gem 'pry-byebug'
   gem 'redcarpet'
-  gem 'rubocop', '1.69.2'
+  gem 'rubocop', '1.87.0'
 end
 
 gemspec