Update rspec-its requirement from ~> 1.2.0 to ~> 1.3.0

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...v1.3.0)

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

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

rspec_api_documentation.gemspec

@@ -27,7 +27,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "rack-test", "~> 0.6.3"
   s.add_development_dependency "rack-oauth2", "~> 1.12.0"
   s.add_development_dependency "webmock", "~> 3.8.3"
-  s.add_development_dependency "rspec-its", "~> 1.2.0"
+  s.add_development_dependency "rspec-its", "~> 1.3.0"
   s.add_development_dependency "faraday", "~> 0.9.2"
   s.add_development_dependency "nokogiri", "~> 1.8.4"
   s.add_development_dependency "yard", "~> 0.9.15"