setup.py: gate GroupNorm SM targets by CUDA version; avoid sm_100#1928

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juyterman1000:fix/groupnorm-arch-cuda-12_6

Commits on Aug 15, 2025

setup.py: gate GroupNorm SM targets by CUDA version; avoid sm_100/sm_120 on CUDA < 12.8; remove duplicate flag append (fixes #1919)
dalakotiashu150-ux
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