[Build] Track upstream apache/tvm-ffi

[junrushao]

DO NOT MERGE

[gemini-code-assist[bot]]

Summary of Changes

Hello @junrushao, 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 synchronizes the local tvm-ffi submodule with its upstream apache/tvm-ffi repository. The primary purpose is to integrate the latest developments and bug fixes, most notably a CMake configuration correction that improves the build process when tvm-ffi is used as a subdirectory. This ensures the project benefits from the most recent stability and compatibility improvements from the dependency.

Highlights

• Submodule Update: The tvm-ffi submodule has been updated to the latest upstream HEAD, specifically commit 58875b99330487e3629778f00a02c2278e3ea851.
• Upstream Fix Included: This update incorporates a critical CMake fix from the upstream apache/tvm-ffi repository, addressing issues when building as a subdirectory.

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