Use newer wgpu/wgsl version

[jembishop]

Seems like an old version of wgpu and wgsl shader version is being used.
Is it worth to update?
I would like to a compute shader with nannou, but there is an unresolvable clash if I use
2 wgpu versions it looks like.

Also the out of date wgpu makes the examples and docs for using wgpu and nannou out of sync and a
bit confusing.

I would be willing to contribute if help is needed.
Thanks.

[tychedelia]

Hi!

You may have seen our plans to replace Nannou's backend with Bevy: #953. This will keep us up to date on wgpu as well as provide more sophisticated tools for building things like compute shaders!