Remove gem cert chain to use Trusted Publishing

Author: danielmorrison

awesome_nested_set.gemspec

@@ -26,9 +26,4 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'pry-nav'
   s.add_development_dependency 'rake', '~> 13'
   s.add_development_dependency 'rspec-rails', '>= 4.0.0', '< 8.0'
-
-  s.cert_chain = [File.expand_path('certs/parndt.pem', __dir__)]
-  if $PROGRAM_NAME =~ /gem\z/ && ARGV.include?('build') && ARGV.include?(__FILE__)
-    s.signing_key = File.expand_path('~/.ssh/gem-private_key.pem')
-  end
 end