Update rspec-its requirement from ~> 1.2 to ~> 2.0

Updates the requirements on [rspec-its](https://github.com/rspec/rspec-its) to permit the latest version.
- [Changelog](https://github.com/rspec/rspec-its/blob/main/Changelog.md)
- [Commits](rspec/rspec-its@v1.2.0...v2.0.0)

---
updated-dependencies:
- dependency-name: rspec-its
  dependency-version: 2.0.0
  dependency-type: direct:development
...

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

Author: dependabot[bot]

Gemfile

@@ -10,5 +10,5 @@ group :development, :test do
   gem "rails", "~> #{ENV['RAILS_VERSION']}" if ENV["RAILS_VERSION"]
   gem "rspec", "~> 3.13"
   gem "rspec-github", "~> 2.4.0"
-  gem "rspec-its", "~> 1.2"
+  gem "rspec-its", "~> 2.0"
 end