Update rubocop requirement from 1.52.1 to 1.63.4

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@v1.52.1...v1.63.4)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-type: direct:production
...

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

Gemfile

@@ -11,7 +11,7 @@ gem 'fastlane'
 gem 'rake'
 gem 'rspec'
 gem 'rspec_junit_formatter'
-gem 'rubocop', '1.52.1'
+gem 'rubocop', '1.63.4'
 gem 'rubocop-performance'
 gem 'rubocop-rake', '0.6.0'
 gem 'rubocop-require_tools'