Upgrade flashmla kernel for NSA tp support

[YAMY1234]

Motivation

Modifications

Accuracy Tests

Benchmarking and Profiling

Checklist

• [ ] Format your code according to the Format code with pre-commit.
• [ ] Add unit tests according to the Run and add unit tests.
• [ ] Update documentation according to Write documentations.
• [ ] Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.
• [ ] Follow the SGLang code style guidance.
• [ ] Work with maintainers to merge your PR. See the PR Merge Process

[gemini-code-assist[bot]]

Summary of Changes

Hello @YAMY1234, I'm Gemini Code Assist[^1]! 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 focuses on integrating an updated version of the FlashMLA kernel. The primary goal of this upgrade is to enable enhanced Tensor Parallelism capabilities, ensuring the system can leverage the latest optimizations and features provided by the FlashMLA project.

Highlights

• FlashMLA Kernel Upgrade: The FlashMLA kernel dependency has been updated to a newer commit (be055fb7df0090fde45f08e9cb5b8b4c0272da73) to incorporate recent improvements, specifically for Tensor Parallelism (TP) support.

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[Fridge003]

All dpsk v3.2 related tests passed https://github.com/sgl-project/sglang/actions/runs/19608731556?pr=13718