Update rubocop-performance requirement from ~> 1.23.1 to ~> 1.26.0

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@v1.23.1...v1.26.0)

---
updated-dependencies:
- dependency-name: rubocop-performance
  dependency-version: 1.26.0
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

publify_amazon_sidebar.gemspec

@@ -27,7 +27,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rubocop", "~> 1.77.0"
   spec.add_development_dependency "rubocop-capybara", "~> 2.21.0"
   spec.add_development_dependency "rubocop-factory_bot", "~> 2.26.1"
-  spec.add_development_dependency "rubocop-performance", "~> 1.23.1"
+  spec.add_development_dependency "rubocop-performance", "~> 1.26.0"
   spec.add_development_dependency "rubocop-rails", "~> 2.29.1"
   spec.add_development_dependency "rubocop-rspec", "~> 3.4.0"
   spec.add_development_dependency "rubocop-rspec_rails", "~> 2.30.0"