Update rubocop-rspec requirement from ~> 2.19 to ~> 3.0

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@v2.19.0...v3.0.0)

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

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

Gemfile

@@ -31,7 +31,7 @@ group :development do
   gem 'rspec', '~> 3.1'
   gem 'rspec-its', '~> 1.0'
   gem 'rubocop', '~> 1.50.0', require: false
-  gem 'rubocop-rspec', '~> 2.19', require: false
+  gem 'rubocop-rspec', '~> 3.0', require: false
   gem 'rubocop-performance', '~> 1.16', require: false
   gem 'rubocop-factory_bot', '!= 2.26.0', require: false
   gem 'rubocop-rspec_rails', '!= 2.29.0', require: false