Bump the rubocop-dependencies group with 1 update (#236)

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@v1.19.1...v1.20.0)

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

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

Gemfile

@@ -17,7 +17,7 @@ group(:development) do
   gem('benchmark-ips', '~> 2.12.0', require: false)
   gem('rubocop', '~> 1.59.0', require: false)
   gem('rubocop-rake', '~> 0.6.0', require: false)
-  gem('rubocop-performance', '~> 1.19.1', require: false)
+  gem('rubocop-performance', '~> 1.20.0', require: false)
   gem('rubocop-thread_safety', '~> 0.5.1', require: false)
 end