build(deps-dev): update rubocop requirement from ~> 1.54.1 to ~> 1.56.0

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@v1.54.1...v1.56.0)

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

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

cnab240_bancoabc.gemspec

@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "pry", "~> 0.14.1"
   s.add_development_dependency "rake", "~> 13.0.6", ">= 10.0.0"
   s.add_development_dependency "rspec", "~> 3.12.0"
-  s.add_development_dependency "rubocop", "~> 1.54.1"
+  s.add_development_dependency "rubocop", "~> 1.56.0"
   s.add_development_dependency "rubocop-i18n", "~> 3.0.0"
   s.add_development_dependency "rubocop-packaging", "~> 0.5.1"
   s.add_development_dependency "rubocop-performance", "~> 1.18.0"