Update rubocop requirement from 1.39.0 to 1.41.1

Updates the requirements on [rubocop](https://github.com/rubocop/rubocop) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.39.0...v1.41.1)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-type: direct:production
...

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

Gemfile

@@ -6,7 +6,7 @@ gem "minitest", "~> 5.11"
 gem "minitest-ci", "~> 3.4"
 gem "minitest-reporters", "~> 1.3"
 gem "rake", "~> 13.0"
-gem "rubocop", "1.39.0"
+gem "rubocop", "1.41.1"
 gem "rubocop-minitest", "0.24.0"
 gem "rubocop-packaging", "0.5.2"
 gem "rubocop-performance", "1.15.1"