Update to Naga b209d911 (2022-9-1).

[jimblandy]

This removes an expected failure on AMD RADV. I guess #2751 was our
bug all along.

Checklist

• Run cargo clippy.
• Run RUSTFLAGS=--cfg=web_sys_unstable_apis cargo clippy --target wasm32-unknown-unknown if applicable.
• Add change to CHANGELOG.md. See simple instructions inside file.

[jimblandy]

Hopefully it will also sort out our CI problems.

[jimblandy]

Okay, it looks like we missed some spots:

$ cd wgpu/examples/skybox/
$ naga shader.wgsl shader.spv
$ spirv-val --target-env vulkan1.0 shader.spv
error: line 79: [VUID-StandaloneSpirv-Flat-06202] OpEntryPoint interfaces variable must not be vertex execution model with an input storage class for Entry Point id 40.
  %gl_VertexIndex = OpVariable %_ptr_Input_uint Input

[jimblandy]

Converted to draft since this takes Naga from a branch in my repo.