Update rubocop-rspec requirement from ~> 1.40 to ~> 2.29

Updates the requirements on [rubocop-rspec](https://github.com/rubocop/rubocop-rspec) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop-rspec/releases)
- [Changelog](https://github.com/rubocop/rubocop-rspec/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-rspec@v1.40.0...v2.29.1)

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

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

beaker-answers.gemspec

@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rspec', '~> 3.0'
   s.add_development_dependency 'rspec-its'
   s.add_development_dependency 'rubocop', '~> 1.53'
-  s.add_development_dependency 'rubocop-rspec', '~> 1.40'
+  s.add_development_dependency 'rubocop-rspec', '~> 2.29'
   s.add_development_dependency 'simplecov', '~> 0.22.0'
 
   # Documentation dependencies