Update rubocop-rspec requirement from ~> 2.28.0 to ~> 2.29.1

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@v2.28.0...v2.29.1)

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

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

Gemfile

@@ -16,7 +16,7 @@ group :development do
   gem 'rspec-benchmark',       '~> 0.6.0'
   gem 'rubocop',               '~> 1.62.0'
   gem 'rubocop-performance',   '~> 1.21.0'
-  gem 'rubocop-rspec',         '~> 2.28.0'
+  gem 'rubocop-rspec',         '~> 2.29.1'
   gem 'rubocop-rspec_rails',   '~> 2.28.2'
   gem 'simplecov',             '>= 0.18.0', '< 0.23.0'
   gem 'yard',                  '~> 0.9.5'