Added support for useCurrentOnUpdate modifier

[promatik]

Since v8.36.0, Laravel supports the useCurrentOnUpdate modifier – laravel/framework#36817
This PR adds it to the list of $modifiers.

[jasonmccreary]

@promatik, could you add this to a draft file for one of the migrations (or make a new one) so we have coverage.

[promatik]

Sure @jasonmccreary, I added it to ModelLexerTest.php, there was a test using useCurrent on a saved_at column. I added another column named updated_at with useCurrentOnUpdate.

[promatik]

End up adding it to the drafts/post.yaml too.