install: remove nvidia-cudnn-12 from package dependency

[yzh119]

📌 Description

The dependency is not required because:

1. For x86_64 user environments that installs pytorch from pypi, nvidia-cudnn-12 is already a torch dependency (https://github.com/pytorch/pytorch/blob/3f1636ebef9b45e8a3cb0eb20d327ee6acb74be0/.github/scripts/generate_binary_build_matrix.py#L44-L95), and flashinfer depends on torch, there is no need to specify another nvidia-cudnn-12 dependency in flashinfer.
2. For user environments where nvidia-cudnn-12 is not a torch dependency (like in nvidia's pytorch container), cudnn is installed at system wide and cudnn-frontend will rely on cudnn system installation instead of through nvidia-cudnn-12.

🔍 Related Issues

nvidia-nvshmem-12 package is a similar redundant dependency: #1388

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Reviewer Notes

[gemini-code-assist]

Summary of Changes

Hello @yzh119, 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!

I'm removing the nvidia-cudnn-cu12 package from FlashInfer's dependencies. This change streamlines the installation process by eliminating a redundant dependency that is either already provided by PyTorch or handled by system-wide cuDNN installations in specific environments.

Highlights

• Dependency Optimization: I've removed "nvidia-cudnn-cu12" from the install_requires list in setup.py. This dependency was found to be redundant, simplifying the installation process for users.
• Rationale for Removal: The removal is justified because for PyPI installations, "nvidia-cudnn-cu12" is already a transitive dependency via PyTorch. In containerized environments, cuDNN is typically installed system-wide, making this package unnecessary.

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[gemini-code-assist]

Code Review

This pull request removes the nvidia-cudnn-cu12 dependency from install_requires. This change is well-justified, as this package is typically a transitive dependency of PyTorch when installed from PyPI, or is expected to be present system-wide in environments like NVIDIA's containers. Removing this explicit dependency helps to avoid redundancy and potential conflicts. The change is correct and I have no further suggestions.

[EmilienM]

thanks!