chore: Update rubocop requirement from = 1.69.2 to = 1.70.0

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...v1.70.0)

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

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

Author: dependabot[bot]

appium_lib.gemspec

@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'minitest-reporters', '~> 1.1'
   s.add_development_dependency 'pry'
   s.add_development_dependency 'rake', '~> 13.0'
-  s.add_development_dependency 'rubocop', '1.69.2'
+  s.add_development_dependency 'rubocop', '1.70.0'
   s.add_development_dependency 'yard', '~> 0.9.11'
 
   s.files = `git ls-files`.split("\n").reject { |v| v.match(/\A^(ios_tests|android_tests|grid|test_apps)\/.+/) }