Use with_connection instead of lease_connection in TypeCaster::Connection

Author: andrewn617

activerecord/lib/active_record/type_caster/connection.rb

@@ -19,7 +19,7 @@ def type_for_attribute(attr_name)
         if schema_cache.data_source_exists?(table_name)
           column = schema_cache.columns_hash(table_name)[attr_name.to_s]
           if column
-            type = @klass.lease_connection.lookup_cast_type_from_column(column)
+            type = @klass.with_connection { |connection| connection.lookup_cast_type_from_column(column) }
           end
         end