Update ROCm index for Forge/reForge installs to 6.4

[NeuralFault]

This pull request updates the logic for selecting PyTorch and ROCm versions during package installation in SDWebForge.cs. The main changes ensure that the latest PyTorch is used for both Blackwell and AMD ROCm environments, and that the ROCm version is upgraded for AMD GPUs.

Dependency and environment handling:

• Updated the logic to use the latest PyTorch version (by leaving the version string empty) for both Blackwell GPUs and AMD ROCm environments, instead of only for Blackwell.
• Upgraded the ROCm version from rocm5.7 to rocm6.4 for AMD GPUs.

[gemini-code-assist]

Summary of Changes

Hello @NeuralFault, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the dependency management within the SDWebForge.cs installation process. The primary goal is to ensure that users leveraging either Blackwell or AMD ROCm GPUs benefit from the latest available PyTorch versions, while also specifically upgrading the ROCm support to version 6.4 for AMD users. This update aims to enhance compatibility and leverage recent advancements in GPU computing for these environments.

Highlights

• PyTorch Version Selection Logic: The logic for selecting the PyTorch version during package installation has been updated to ensure the latest PyTorch is used for both Blackwell GPUs and AMD ROCm environments. Previously, this logic only applied to Blackwell GPUs.
• ROCm Version Upgrade: The ROCm index for AMD GPUs has been upgraded from "rocm5.7" to "rocm6.4" to provide updated support for AMD hardware.

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[gemini-code-assist]

Code Review

This pull request correctly updates the logic for package installation in SDWebForge.cs, specifically upgrading the ROCm version and adjusting the PyTorch version selection for AMD GPUs. The changes are clear and align with the description. I've included one review comment to address some formatting issues to improve code readability and maintain consistency with the existing codebase.

[NeuralFault]

Updated were all installs use latest pytorch. Nvidia index's set to cu128 for blackwell and cu126 for all others, and removed variable for latest pytorch check that is no longer needed.

Ready for merge.

[mohnjiles]

thank you!