Update rubocop-performance requirement from 1.22.1 to 1.23.0 (#401)

Updates the requirements on [rubocop-performance](https://github.com/rubocop/rubocop-performance) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop-performance/releases)
- [Changelog](https://github.com/rubocop/rubocop-performance/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-performance@v1.22.1...v1.23.0)

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

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Author: dependabot[bot]

Gemfile

@@ -6,7 +6,7 @@ gemspec
 
 gem 'coveralls', require: false
 gem 'rubocop', '1.69.0', require: false
-gem 'rubocop-performance', '1.22.1', require: false
+gem 'rubocop-performance', '1.23.0', require: false
 gem 'rubocop-rake', '0.6.0', require: false
 gem 'rubocop-rspec', '3.2.0', require: false
 gem "base64", "~> 0.2.0"