Allow Ruby 4.0

Author: tvdeyen

solidus_auth_devise.gemspec

@@ -16,7 +16,7 @@ Gem::Specification.new do |spec|
   spec.metadata["source_code_uri"] = "https://github.com/solidusio/solidus_auth_devise"
   spec.metadata["changelog_uri"] = "https://github.com/solidusio/solidus_auth_devise/releases"
 
-  spec.required_ruby_version = Gem::Requirement.new(">= 2.5", "< 4")
+  spec.required_ruby_version = Gem::Requirement.new(">= 2.5", "< 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.