Update faraday requirement from >= 0.9.2, < 2 to >= 0.9.2, < 3

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@v0.9.2...v2.0.0)

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

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

duffel_api.gemspec

@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency "base16", "~> 0.0.2"
-  spec.add_dependency "faraday", [">= 0.9.2", "< 2"]
+  spec.add_dependency "faraday", ">= 0.9.2", "< 3"
 
   # Uncomment to register a new dependency of your gem
   # spec.add_dependency "example-gem", "~> 1.0"