chore: update rubocop-performance requirement from ~> 1.25.0 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@v1.25.0...v1.26.0)

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

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

Author: dependabot[bot]

Gemfile

@@ -8,4 +8,4 @@ source 'https://rubygems.org'
 
 gem 'rake', '~> 13.0'
 gem 'rubocop', '~> 1.80.2'
-gem 'rubocop-performance', '~> 1.25.0'
+gem 'rubocop-performance', '~> 1.26.0'