Update rubocop-performance requirement from ~> 1.25.0 to ~> 1.26.1

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@v1.25.0...v1.26.1)

---
updated-dependencies:
- dependency-name: rubocop-performance
  dependency-version: 1.26.1
  dependency-type: direct:development
...

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

Author: dependabot[bot]

publify_core.gemspec

@@ -62,7 +62,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "rubocop", "~> 1.80.2"
   s.add_development_dependency "rubocop-capybara", "~> 2.22.1"
   s.add_development_dependency "rubocop-factory_bot", "~> 2.27.1"
-  s.add_development_dependency "rubocop-performance", "~> 1.25.0"
+  s.add_development_dependency "rubocop-performance", "~> 1.26.1"
   s.add_development_dependency "rubocop-rails", "~> 2.32.0"
   s.add_development_dependency "rubocop-rspec", "~> 3.7.0"
   s.add_development_dependency "rubocop-rspec_rails", "~> 2.32.0"