Update rubocop-performance requirement from = 1.5.2 to = 1.6.1 (#139)

Updates the requirements on [rubocop-performance](https://github.com/rubocop-hq/rubocop-performance) to permit the latest version.
- [Release notes](https://github.com/rubocop-hq/rubocop-performance/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop-performance/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-performance@v1.5.2...v1.6.1)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

tomo.gemspec

@@ -40,5 +40,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "rubocop", "0.82.0"
   spec.add_development_dependency "rubocop-minitest", "0.9.0"
-  spec.add_development_dependency "rubocop-performance", "1.5.2"
+  spec.add_development_dependency "rubocop-performance", "1.6.1"
 end