589: Update to latest wgpu with Naga validation r=cwfitzgerald a=kvark Depends on https://github.com/gfx-rs/wgpu/pull/962 Includes latest Naga validation stuff. ~~Warning: subject to https://github.com/gfx-rs/naga/issues/228~~ Co-authored-by: Dzmitry Malyshau <kvarkus@gmail.com>