chore: update rubocop requirement from 1.77.0 to 1.78.0 (#230)

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@v1.77.0...v1.78.0)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-version: 1.78.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Gemfile

@@ -3,4 +3,4 @@ gemspec
 
 gem 'appium_thor', '~> 2.0'
 gem 'rake', '~> 13.0'
-gem 'rubocop', '1.77.0'
+gem 'rubocop', '1.78.0'