Update faraday requirement from ~> 1.0.0 to ~> 2.9.1

Updates the requirements on [faraday](https://github.com/lostisland/faraday) to permit the latest version.
- [Release notes](https://github.com/lostisland/faraday/releases)
- [Changelog](https://github.com/lostisland/faraday/blob/main/CHANGELOG.md)
- [Commits](lostisland/faraday@v1.0.0...v2.9.1)

---
updated-dependencies:
- dependency-name: faraday
  dependency-type: direct:development
...

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

rspec_api_documentation.gemspec

@@ -28,7 +28,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "rack-oauth2", "~> 1.12.0"
   s.add_development_dependency "webmock", "~> 3.23.0"
   s.add_development_dependency "rspec-its", "~> 1.3.0"
-  s.add_development_dependency "faraday", "~> 1.0.0"
+  s.add_development_dependency "faraday", "~> 2.9.1"
   s.add_development_dependency "nokogiri", "~> 1.8.4"
   s.add_development_dependency "yard", "~> 0.9.15"
   s.add_development_dependency "inch", "~> 0.8.0"