chore: update to bevy 0.16.0

[ihkN]

Updated the example to bevy 0.16.0
With that update the lod didn't update anymore. I've worked around that but i feel like that is a bevy bug.

[aljen]

Thanks for the PR and for bumping Voxelis to Bevy 0.16, really appreciate it! :)

I’m currently focused on finishing some core systems (like gdt-cpus, gdt-jobs, and spatial hierarchy work in voxelis itself), so I’ve put version updates on hold for now.

That said, once I circle back to Bevy integration, I’ll make sure to properly update related modules like vtm-viewer and test the full flow.

Thanks again for taking the time, this kind of initiative really helps move things forward! 😊