Fix failing build related to change in CollectionAssociation#delete

Merge commit 6f1d9d00

activerecord/test/cases/associations/join_model_test.rb

@@ -578,7 +578,7 @@ def test_delete_associate_when_deleting_from_has_many_through_with_multiple_tags
   end
 
   def test_deleting_junk_from_has_many_through_should_raise_type_mismatch
-    assert_raise(ActiveRecord::AssociationTypeMismatch) { posts(:thinking).tags.delete("Uhh what now?") }
+    assert_raise(ActiveRecord::AssociationTypeMismatch) { posts(:thinking).tags.delete(Object.new) }
   end
 
   def test_has_many_through_sum_uses_calculations