remove post-install message

i18n.gemspec

@@ -25,9 +25,5 @@ Gem::Specification.new do |s|
   s.require_path = 'lib'
   s.required_rubygems_version = '>= 1.3.5'
   s.required_ruby_version = '>= 2.3.0'
-  s.post_install_message = if RUBY_VERSION < '3.2'
-                              "PSA: I18n will be dropping support for Ruby < 3.2 in the next major release (April 2025), due to Ruby's end of life for 3.1 and below (https://endoflife.date/ruby). Please upgrade to Ruby 3.2 or newer by April 2025 to continue using future versions of this gem."
-  end
-
   s.add_dependency 'concurrent-ruby', '~> 1.0'
 end