Unity 6.3 warning about Shader Graph

### Describe the bug 💬

I get this warning multiple times after I open my project in Unity 6.3.

Shader Graph at Packages/org.khronos.unitygltf/Runtime/Shaders/ShaderGraph/PBRGraph.shadergraph has 1 warning(s), the first is: There is a newer version of this node available. Inspect node for details.

### Steps to reproduce 🔢

1. Open a Unity project containing a UnityGLTF package.
2. See the console for warnings.

### Files to reproduce the issue ♻

_No response_

### Editor Version 🎲

Other (Provide details below)

### Render Pipeline and version

17.3

### UnityGLTF Version

6.3

### Operating System 👩‍💻

Windows

### When does this problem happen?

- [ ] Editor Import
- [ ] Runtime Import
- [ ] Editor Export
- [ ] Runtime Export

### Additional Info 📜

_No response_

### Validations 🩹

- [x] I have [searched existing issues](https://github.com/KhronosGroup/UnityGLTF/issues): no issue already exist that reports the same problem.
- [x] I follow the [Code of Conduct](https://www.khronos.org/about/code-of-conduct)
- [x] I provided a [minimal reproducible example](https://stackoverflow.com/help/minimal-reproducible-example), including files when necessary.

Start by opening Packages/org.khronos.unitygltf/Runtime/Shaders/ShaderGraph/PBRGraph.shadergraph in Unity 6.3 with Render Pipeline 17.3 and inspect the reported node warning. Compare the graph's node versions with the current Shader Graph guidance; done means the project no longer reports this warning after opening.

Written by the indexing model from the issue text.