lovefromisrael from what I understand, Pixel Camera Services is there to help provide some additional functionality for the GrapheneOS Camera app (as you may have noticed, night mode has been added).
The app cannot be updated by Aurora. You can add it to Aurora's "blacklist manager" so it doesn't attempt to update Pixel Camera Services again. For now, Pixel Camera Services may be updated when we get OS updates, but in the future it may be updated via the Apps app.