12: Use getOriginal() not ->original

Actually, this can be done in a backwards-compatible way:

https://git.drupalcode.org/project/search_api/-/blob/8.x-1.x/src/Entity/...

ptmkenny → closed merge request !87

ptmkenny → reopened merge request !87

ptmkenny → closed merge request !87

Hmmm... I don't see why this is causing phpunit to fail on 11.1. I'll have to come back to this later, but if anyone sees a solution, feel free to jump in!