Upgrade MI325 CI from ROCm 7.0 to 7.2

[v0i0]

Summary

• PyTorch stopped publishing nightly builds for the rocm7.0 index on Feb 6, 2026, so MI325 CI has been stuck on torch==2.11.0.dev20260206+rocm7.0 for ~2 months
• This causes intermittent GPU crashes (Fatal Python error: Aborted inside Triton's _init_handles) due to the stale torch/Triton version mismatch
• Upgrade to rocm7.2 which has fresh nightlies (latest: torch==2.12.0.dev20260401+rocm7.2)

Test plan

• MI325 CI job passes on this PR

🤖 Generated with Claude Code

[v0i0]

was hoping this would stop mi325x from crashing, alas

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