Update wgpu dependency in the examples

[tgross35]

It says this is an issue with metal so I don't think it is the same as #721

== wgpu example ==
Controls:
  Arrow keys: scrolling
  PgUp/PgDown: zoom in/out
  b: toggle drawing the background
  a/z: increase/decrease the stroke width
2023-11-27 03:58:23.239 wgpu[80219:4242123] CAMetalLayer ignoring invalid setDrawableSize width=4294967295.000000 height=4294967295.000000
[2023-11-27T08:58:23Z ERROR wgpu::backend::direct] Handling wgpu errors as fatal by default
thread 'main' panicked at /Users/tmgross/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wgpu-0.13.1/src/backend/direct.rs:2391:5:
wgpu error: Validation Error

Caused by:
    In Device::create_texture
      note: label = `Depth texture`
    Dimension X value 4294967295 exceeds the limit of 8192

[tgross35]

Maybe this would get better if the wgpu dependency was bumped, the example is on 0.13.1 and latest is 0.18.0

[nical]

Indeed, I'll repurpose this issue for that.