Allow Ruby 4

Author: AlistairNorman

solidus_affirm_v2.gemspec

@@ -17,7 +17,7 @@ Gem::Specification.new do |spec|
   spec.metadata["source_code_uri"] = "https://github.com/solidusio-contrib/solidus_affirm_v2"
   spec.metadata["changelog_uri"] = "https://github.com/solidusio-contrib/solidus_affirm_v2/releases"
 
-  spec.required_ruby_version = Gem::Requirement.new("~> 3.0")
+  spec.required_ruby_version = Gem::Requirement.new(">= 3.2", "< 5")
 
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.