build: update Transformer Engine to release_v2.20.2-nemo tip

[balasaajay]

What does this PR do?

Pin Transformer Engine to 44f31bbeaf99bd30a67b928000d4b980026debd2, the tip of release_v2.20.2-nemo resolved on 2026-10-09. The effective TE source advances from 6ea2a74a to 44f31bbe, picking up the fused grouped MLP deterministic-dprob fix in NVIDIA/TransformerEngine#3635.

Changelog

• Advance the MCore submodule from 441a987409b8fdd2b90b463f7999bac970109a43 to 4e7f45066b37a88060058ff012eeacb37c90f7d0, the signed companion NVIDIA/Megatron-LM#8036 revision. Bridge resolves TE through MCore and its dependency-layer check requires their locked TE sources to agree. This advance also includes the 15 MCore main commits between the old gitlink and the companion PR's base; merge the companion PR first.
• Align Bridge's stale standalone TE source declaration with the effective MCore source, and set source metadata to 2.20.2+44f31bbe.
• Regenerate uv.lock using uv 0.7.2 in the existing nvcr.io/nvidia/pytorch:26.08-py3 base. All 345 package names remain unchanged and no unrelated package versions move. The resolver also normalizes existing platform markers; forcing re-resolution on the unchanged base reproduces those same marker changes.

Validation

• uv lock and uv lock --check in the supported PyTorch base container.
• uv run --no-sync pre-commit run --all-files in a Bridge CI container.
• .github/scripts/test_docker_dependency_layers.sh, including exact Bridge/MCore TE source equality.
• Compare the regenerated base and update lock graphs: only the MCore TE requirement and TE package change.
• git diff --check.
• Native TE rebuild/import and H100/GB200 unit/functional CI. Local checks above do not establish GPU runtime correctness; needs-more-tests and full-test-suite request the expanded CI matrix.

Before ready for review

• Followed the contributor guidelines; commit signed and signed off.
• Existing dependency validation covers the pin/lock change; no new product tests or documentation are needed.
• Review the companion MCore PR and final CI results before merging.

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[balasaajay]

/ok to test 3aed45c