[CI/Build] Upgrade flashinfer to 0.4.0, pytorch to 2.8.0, python to >=3.11

[MohammedAdain]

FILL IN THE PR DESCRIPTION HERE

FIX #xxxx (link existing issues this PR will resolve)

BEFORE SUBMITTING, PLEASE READ THE CHECKLIST BELOW AND FILL IN THE DESCRIPTION ABOVE

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PR Checklist (Click to Expand)

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[MohammedAdain]

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