Update wesl requirement from 0.2.0 to 0.3.1 (#22122)

Updates the requirements on
[wesl](https://github.com/wgsl-tooling-wg/wesl-rs) to permit the latest
version.
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crates/bevy_shader/Cargo.toml

@@ -19,7 +19,7 @@ wgpu-types = { version = "27", default-features = false }
 naga = { version = "27", features = ["wgsl-in"] }
 serde = { version = "1", features = ["derive"] }
 thiserror = { version = "2", default-features = false }
-wesl = { version = "0.2.0", optional = true }
+wesl = { version = "0.3.1", optional = true }
 tracing = { version = "0.1", default-features = false, features = ["std"] }