BadRequest when filtering with invalid UUID

[pehbehbeh]

This works:

https://backpex.live/admin/posts?filters[user_id][]=098f1b60-54d6-40bc-a8f9-986b2c95c1a9

This results in a bad request:

https://backpex.live/admin/posts?filters[user_id][]=INVALID

This is because we are trying to cast the value to a UUID internally.