Allow using include_wgsl! in const contexts (#5872)

* include_wgsl! Switch from into() call to construction

This allows usage in const contexts.

* Describe constification of include_wgsl! in changelog

CHANGELOG.md

@@ -131,6 +131,10 @@ By @atlv24 in [#5383](https://github.com/gfx-rs/wgpu/pull/5383)
 - Implement `WGSL`'s `unpack4xI8`,`unpack4xU8`,`pack4xI8` and `pack4xU8`. By @VlaDexa in [#5424](https://github.com/gfx-rs/wgpu/pull/5424)
 - Began work adding support for atomics to the SPIR-V frontend. Tracking issue is [here](https://github.com/gfx-rs/wgpu/issues/4489). By @schell in [#5702](https://github.com/gfx-rs/wgpu/pull/5702).
 
+#### WebGPU
+
+- `include_wgsl!` is now callable in const contexts by @9SMTM6 in [#5872](https://github.com/gfx-rs/wgpu/pull/5872)
+
 ### Changes
 
 #### General

wgpu/src/macros.rs

@@ -95,7 +95,7 @@ macro_rules! include_wgsl {
             //log::info!("including '{}'", $($token)*);
             $crate::ShaderModuleDescriptor {
                 label: Some($($token)*),
-                source: $crate::ShaderSource::Wgsl(include_str!($($token)*).into()),
+                source: $crate::ShaderSource::Wgsl(std::borrow::Cow::Borrowed(include_str!($($token)*))),
             }
         }
     };