Add missing null default to nullable query property

[zluiten]

Fixes failing tests and adjusts the github actions config to include php 8.2

[zluiten]

Not sure why the github actions do not run.

Edit: Oh I see, they are configured to run on push (and not pull_request)

Edit2: I've modified the github actions config to also run on pull_request. Let me know if that is not supposed to be the case.

[prolic]

Thanks @zluiten