Update to wgpu 0.20 (emilk#4560)

* this PR reverts emilk#4559
* and re-applies emilk#4433

Before we merge, we're waiting for a wgpu 0.20.1 patch-release of

* gfx-rs/wgpu#5681

---------

Co-authored-by: Andreas Reich <[email protected]>

Author: emilk

.github/workflows/rust.yml

@@ -108,7 +108,7 @@ jobs:
       - name: wasm-bindgen
         uses: jetli/[email protected]
         with:
-          version: "0.2.90"
+          version: "0.2.92"
 
       - run: ./scripts/wasm_bindgen_check.sh --skip-setup