Fix random CI failure due to non-deterministic sorting order

Reference:
https://buildkite.com/rails/rails/builds/64354#206d3411-0f15-4aa4-aa25-83117ef3bcc0/1006-1017

activerecord/test/cases/relations_test.rb

@@ -2057,7 +2057,7 @@ def test_locked_should_not_build_arel
   end
 
   def test_relation_join_method
-    assert_equal "Thank you for the welcome,Thank you again for the welcome", Post.first.comments.join(",")
+    assert_equal "Thank you for the welcome,Thank you again for the welcome", Post.first.comments.order(:id).join(",")
   end
 
   def test_relation_with_private_kernel_method