Rust code does not build due to proc_macro2 dependency

[stefnotch]

cached depends on an old version of proc_macro2, which suffers from rust-lang/rust#113152
I suppose updating all the dependencies would be in order.

As a side note, this message also appears.

warning: `D:\Coding\GitHub\Libraries\compute.toys\wgpu-compute-toy\.cargo\config` is deprecated in favor of `config.toml`
note: if you need to support cargo 1.38 or earlier, you can symlink `config` to `config.toml`

I'll happily submit PRs to fix this.