Update rspec-its requirement from ~> 1.0 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@v1.0.0...v2.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

contracted_value.gemspec

@@ -38,7 +38,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "appraisal", "~> 2.0", ">= 2.5.0"
 
   s.add_development_dependency "rspec", "~> 3.0"
-  s.add_development_dependency "rspec-its", "~> 1.0"
+  s.add_development_dependency "rspec-its", "~> 2.0"
 
   s.add_development_dependency "simplecov", ">= 0.21"
   s.add_development_dependency "simplecov-lcov", ">= 0.8"