Remove EVT tests because they're making the test suite hang

Author: rmosolgo

spec/graphql/dataloader/nonblocking_dataloader_spec.rb

@@ -251,11 +251,11 @@ def self.included(child_class)
         include NonblockingDataloaderAssertions
       end
 
-      describe "with evt" do
-        require "evt"
-        let(:scheduler_class) { Evt::Scheduler }
-        include NonblockingDataloaderAssertions
-      end
+      # describe "with evt" do
+      #   require "evt"
+      #   let(:scheduler_class) { Evt::Scheduler }
+      #   include NonblockingDataloaderAssertions
+      # end
     end
   end
 end