Update to wgpu 0.20.1 (linebender#631)

This also updates `wgpu-core` and `wgpu-hal` to the corresponding
versions (which are 0.21.x).

This fixes some undefined behavior when building with Rust 1.79 and
using the Direct3D 12 backend:
gfx-rs/wgpu#5812

It also fixes an issue on OpenGL where non-sRGB was still using sRGB:
gfx-rs/wgpu#5642

Cargo.toml

@@ -46,7 +46,7 @@ static_assertions = "1.1.0"
 thiserror = "1.0.61"
 
 # NOTE: Make sure to keep this in sync with the version badge in README.md and vello/README.md
-wgpu = { version = "0.20.0" }
+wgpu = { version = "0.20.1" }
 log = "0.4.21"
 
 # Used for examples

README.md

@@ -16,7 +16,7 @@ For now, prefer updating the package-level readmes, e.g. vello/README.md.
 [![Linebender Zulip](https://img.shields.io/badge/Linebender-%23gpu-blue?logo=Zulip)](https://xi.zulipchat.com/#narrow/stream/197075-gpu)
 [![dependency status](https://deps.rs/repo/github/linebender/vello/status.svg)](https://deps.rs/repo/github/linebender/vello)
 [![MIT/Apache 2.0](https://img.shields.io/badge/license-MIT%2FApache-blue.svg)](#license)
-[![wgpu version](https://img.shields.io/badge/wgpu-v0.20.0-orange.svg)](https://crates.io/crates/wgpu)
+[![wgpu version](https://img.shields.io/badge/wgpu-v0.20.1-orange.svg)](https://crates.io/crates/wgpu)
 
 [![Crates.io](https://img.shields.io/crates/v/vello.svg)](https://crates.io/crates/vello)
 [![Docs](https://docs.rs/vello/badge.svg)](https://docs.rs/vello)

vello/README.md

@@ -7,7 +7,7 @@
 [![Latest published version.](https://img.shields.io/crates/v/vello.svg)](https://crates.io/crates/vello)
 [![Documentation build status.](https://img.shields.io/docsrs/vello.svg)](https://docs.rs/vello)
 [![Apache 2.0 or MIT license.](https://img.shields.io/badge/license-Apache--2.0_OR_MIT-blue.svg)](#license)
-[![Required wgpu version.](https://img.shields.io/badge/wgpu-v0.20.0-orange.svg)](https://crates.io/crates/wgpu)
+[![Required wgpu version.](https://img.shields.io/badge/wgpu-v0.20.1-orange.svg)](https://crates.io/crates/wgpu)
 \
 [![Linebender Zulip chat.](https://img.shields.io/badge/Linebender-%23gpu-blue?logo=Zulip)](https://xi.zulipchat.com/#narrow/stream/197075-gpu)
 [![GitHub Actions CI status.](https://img.shields.io/github/actions/workflow/status/linebender/vello/ci.yml?logo=github&label=CI)](https://github.com/linebender/vello/actions)