Remove redundant `column_name.to_s`

`attr.name` is already normalized as a string and alias resolved.

Ref #39881.

activerecord/lib/active_record/persistence.rb

@@ -415,7 +415,7 @@ def discriminate_class_for_record(record)
         def _substitute_values(values)
           values.map do |name, value|
             attr = arel_table[name]
-            bind = predicate_builder.build_bind_attribute(name, value)
+            bind = predicate_builder.build_bind_attribute(attr.name, value)
             [attr, bind]
           end
         end

activerecord/lib/active_record/relation/predicate_builder.rb

@@ -69,7 +69,7 @@ def build(attribute, value, operator = nil)
     end
 
     def build_bind_attribute(column_name, value)
-      attr = Relation::QueryAttribute.new(column_name.to_s, value, table.type(column_name))
+      attr = Relation::QueryAttribute.new(column_name, value, table.type(column_name))
       Arel::Nodes::BindParam.new(attr)
     end