Regenerate gemspec on newer rubygems

Author: sporkmonger

addressable.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
   s.licenses = ["Apache-2.0".freeze]
   s.rdoc_options = ["--main".freeze, "README.md".freeze]
   s.required_ruby_version = Gem::Requirement.new(">= 2.2".freeze)
-  s.rubygems_version = "3.6.3".freeze
+  s.rubygems_version = "4.0.8".freeze
   s.summary = "URI Implementation".freeze
 
   s.specification_version = 4