Update 3rd party megatron-lm to tot#1042

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yaoyu-33 wants to merge 2 commits intomainfrom

yuya/update_megatron

Commits on Sep 2, 2025

upgrade megatron
yaoyu-33
committed

Commits on Sep 3, 2025

Update Megatron-LM submodule to latest yuya/nemo-rl-use-2 branch (383d1144)
yaoyu-33
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