squash: declare correct appraisals

Author: arielvalentin

instrumentation/action_mailer/Appraisals

@@ -10,10 +10,6 @@
   end
 end
 
-appraise 'action_mailer-latest' do
-  gem 'rails'
-end
-
 if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('3.1.0')
   %w[7.2.0].each do |version|
     appraise "action_mailer-#{version}" do