add cgi gem for ruby 3.5

Author: joelhawksley

view_component.gemspec

@@ -86,4 +86,8 @@ Gem::Specification.new do |spec|
     spec.add_development_dependency "mutex_m"
     spec.add_development_dependency "propshaft", "~> 1.1.0"
   end
+
+  if RUBY_VERSION >= "3.5"
+    spec.add_development_dependency "cgi"
+  end
 end