No need for bundler as development dependency

It happend in 2015 with 5b241f6

I think it is more confusing than helping. Most people know that you use
Bundler to install gems listed in a Gemfile. This requirement also makes
it harder to build the gem with newer Bundler.

Author: dentarg

addressable.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
   s.metadata = { "changelog_uri" => "https://github.com/sporkmonger/addressable/blob/main/CHANGELOG.md#v2.8.8" } if s.respond_to? :metadata=
   s.require_paths = ["lib".freeze]
   s.authors = ["Bob Aman".freeze]
-  s.date = "2025-11-24"
+  s.date = "2026-01-25"
   s.description = "Addressable is an alternative implementation to the URI implementation that is\npart of Ruby's standard library. It is flexible, offers heuristic parsing, and\nadditionally provides extensive support for IRIs and URI templates.\n".freeze
   s.email = "bob@sporkmonger.com".freeze
   s.extra_rdoc_files = ["README.md".freeze]
@@ -18,11 +18,10 @@ 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 = "3.7.2".freeze
+  s.rubygems_version = "4.0.4".freeze
   s.summary = "URI Implementation".freeze
 
   s.specification_version = 4
 
   s.add_runtime_dependency(%q<public_suffix>.freeze, [">= 2.0.2".freeze, "< 8.0".freeze])
-  s.add_development_dependency(%q<bundler>.freeze, [">= 1.0".freeze, "< 3.0".freeze])
 end

tasks/gem.rake

@@ -14,15 +14,9 @@ namespace :gem do
     s.extra_rdoc_files = %w( README.md )
     s.rdoc_options.concat ["--main",  "README.md"]
 
-    if !s.respond_to?(:add_development_dependency)
-      puts "Cannot build Gem with this version of RubyGems."
-      exit(1)
-    end
-
     s.required_ruby_version = ">= 2.2"
 
     s.add_runtime_dependency "public_suffix", ">= 2.0.2", "< 8.0"
-    s.add_development_dependency "bundler", ">= 1.0", "< 3.0"
 
     s.require_path = "lib"