Panic on Binding Issue: Occlusion Map in Greyscale 16-bit

## Bevy version

0.12.1
Also tested on commit hash: 41c362051cbfc57ecbaca57b8546a5695717b727

## \[Optional\] Relevant system information

Tested on:
MacBook Pro, 2023, Apple M2 Max
macOS Ventura 13.5.2
AdapterInfo { name: "Apple M2 Max", vendor: 0, device: 0, device_type: IntegratedGpu, driver: "", driver_info: "", backend: Metal }

Also tested on:
Dell Precision 7670
Windows 11 Enterprise (10.0.22621 Build 22621)

## What you did

I tested using the following asset:
[SciFiHelmet](https://github.com/KhronosGroup/glTF-Sample-Assets/tree/main/Models/SciFiHelmet/glTF)

I converted the ambient occlusion map to greyscale 16-bit, as here:

I test-loaded the modified asset using a quick modification to the load_gltf example. The relevant code is:
```
commands.spawn(SceneBundle {
scene: asset_server.load("models/SciFiHelmet/SciFiHelmet.gltf#Scene0"),
..default()
});
```

## What went wrong

The application panics on a WGPU error related to the binding of the AO texture:

```
2024-01-03T18:37:36.173278Z ERROR wgpu::backend::direct: Handling wgpu errors as fatal by default
thread 'Compute Task Pool (3)' panicked at /Users/jasonbond/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wgpu-0.18.0/src/backend/direct.rs:3111:5:
wgpu error: Validation Error

Caused by:
In Device::create_bind_group
note: label = `StandardMaterial`
Texture binding 7 expects sample type = Float { filterable: true }, but given a view with format = R16Uint

note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Encountered a panic in system `bevy_pbr::material::prepare_materials`!
thread 'Compute Task Pool (3)' panicked at crates/bevy_render/src/pipelined_rendering.rs:145:45:
called `Result::unwrap()` on an `Err` value: RecvError
thread 'main' panicked at /Users/jasonbond/.cargo/registry/src/index.crates.io-6f17d22bba15001f/winit-0.29.8/src/platform_impl/macos/app_state.rs:387:33:
called `Result::unwrap()` on an `Err` value: PoisonError { .. }
```

## Additional information

- Using colour 16-bit or greyscale 8-bit seemed to work fine.
- The repro case above may seem like a weird thing to do, but it's motivated by a collection of protected-IP assets which I'm actually trying to use and which have this format of occlusion texture.