Update 3rd party megatron-lm to tot

[yaoyu-33]

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[github-actions]

✅ Submodule Fast-Forward Check Results

Check based on commit: d656f4c (PR #1042 from yuya/update_megatron)

✅ Submodules that are properly updated:

Megatron-LM: ✅ PR branch is ahead of main branch (fast-forward)

All submodule changes look good! ✨

[github-actions]

✅ Submodule Fast-Forward Check Results

Check based on commit: 41abe6d (PR #1042 from yuya/update_megatron)

✅ Submodules that are properly updated:

Megatron-LM: ✅ PR branch is ahead of main branch (fast-forward)

All submodule changes look good! ✨

[terrykong]

closing since #1059 is merged