Touch updated_at when upsert_all modifies a record

From upstream

Author: dr-itz

lib/arjdbc/postgresql/adapter.rb

@@ -437,6 +437,7 @@ def build_insert_sql(insert) # :nodoc:
         sql << " ON CONFLICT #{insert.conflict_target} DO NOTHING"
       elsif insert.update_duplicates?
         sql << " ON CONFLICT #{insert.conflict_target} DO UPDATE SET "
+        sql << insert.touch_model_timestamps_unless { |column| "#{insert.model.quoted_table_name}.#{column} IS NOT DISTINCT FROM excluded.#{column}" }
         sql << insert.updatable_columns.map { |column| "#{column}=excluded.#{column}" }.join(",")
       end
 

lib/arjdbc/sqlite3/adapter.rb

@@ -346,6 +346,7 @@ def build_insert_sql(insert) # :nodoc:
         sql << " ON CONFLICT #{insert.conflict_target} DO NOTHING"
       elsif insert.update_duplicates?
         sql << " ON CONFLICT #{insert.conflict_target} DO UPDATE SET "
+        sql << insert.touch_model_timestamps_unless { |column| "#{column} IS excluded.#{column}" }
         sql << insert.updatable_columns.map { |column| "#{column}=excluded.#{column}" }.join(",")
       end