Bump rubocop from 1.76.1 to 1.81.1

This release includes some updates in the Style/RedundantParentheses and
Naming/PredicateMethod rules. We're changing the code accordingly.

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.76.1 to 1.81.1.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop/compare/v1.76.1...v1.81.1)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-version: 1.81.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile

@@ -103,7 +103,7 @@ group :development do
   gem "pronto-eslint", "~> 0.11.1", require: false
   gem "pronto-rubocop", "~> 0.11.6", require: false
   gem "pronto-stylelint", "~> 0.11.1", require: false
-  gem "rubocop", "~> 1.76.1", require: false
+  gem "rubocop", "~> 1.81.7", require: false
   gem "rubocop-capybara", "~> 2.22.1", require: false
   gem "rubocop-factory_bot", "~> 2.27.1", require: false
   gem "rubocop-performance", "~> 1.26.1", require: false