Use >= for Ruby version comparison as is done by everyone else

Author: p

spec/mongoid/errors/mongoid_error_spec.rb

@@ -9,7 +9,7 @@
   let(:options) { {} }
 
   before do
-    if RUBY_VERSION.start_with?('3.', '2.7')
+    if RUBY_VERSION >= '2.7'
       {"message_title" => "message", "summary_title" => "summary", "resolution_title" => "resolution"}.each do |key, name|
         expect(::I18n).to receive(:translate).with("mongoid.errors.messages.#{key}", **{}).and_return(name)
       end