Update rubocop-performance requirement from 1.26.0 to 1.26.1 (#210)

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@v1.26.0...v1.26.1)

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

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Author: dependabot[bot]

Gemfile

@@ -9,5 +9,5 @@ gem "rake", "~> 13.0"
 gem "rubocop", "1.81.7"
 gem "rubocop-minitest", "0.38.2"
 gem "rubocop-packaging", "0.6.0"
-gem "rubocop-performance", "1.26.0"
+gem "rubocop-performance", "1.26.1"
 gem "rubocop-rake", "0.7.1"