chore(beep boop 🤖): Bump uv.lock (main, mcore-dev) (2026-06-27)

[svcnvidia-nemo-ci]

🚀 PR to bump uv.lock in main.

🤖 This PR will be merged automatically once CI passes.

[svcnvidia-nemo-ci]

/ok to test 80bc77b

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[yaoyu-33]

MCore bump auto-fix status for dev:

Classification: MCore broke Bridge
Evidence: PR #4539 Launch_Unit_Tests_Core failed in run 28286323896, job 83814573271, completed on 2026-06-27 04:33 PDT. The failed tests are tests/unit_tests/models/gemma/test_gemma4_modeling.py::TestGemma4PLEHelpers::test_patch_ple_block_threading_injects_layer_inputs_and_restores_state, tests/unit_tests/models/gemma/test_gemma4_modeling.py::TestGemma4PLEHelpers::test_patch_ple_block_threading_wraps_checkpointed_forward, and tests/unit_tests/models/gemma/test_gemma4_provider.py::TestGemma4PLEBlockThreading::test_threads_per_layer_inputs_to_each_layer; all fail with AttributeError: module 'megatron.core.transformer.transformer_block' has no attribute 'checkpointed_forward'. The bump moves 3rdparty/Megatron-LM from da42015c8033495cf6cc6523f8525fdb139a21d2 to d963266282a625dce4e9252d03ae8605d52b45da; at the old commit transformer_block.py imports module-level checkpointed_forward, while at the new commit only TransformerBlock._checkpointed_forward remains.
Fix PR: #4445 (existing open PR already covers this same dev failure; I did not open a duplicate fix PR)
Guards: existing PR #4445 adds a narrow module-level vs instance-level checkpointed_forward feature guard with TODO: remove the guard when both MCore main and dev call TransformerBlock._checkpointed_forward directly.
Validation: no new branch or tests were run for this handoff because #4445 already covers the failure. #4445 reports CW interactive validation on 2026-06-22 America/Los_Angeles for the focused Gemma4 tests and full Gemma4 unit files, plus pre-commit, all passing. Latest #4445 CI has Launch_Unit_Tests_Core passing in run 28256574194; its current blockers are L1_Launch_models_stepfun and gb200_L1_Launch_models_stepfun, not the Gemma4 unit failure in #4539.
Next action: review and land #4445 after its StepFun L1 blockers are resolved, then rerun or supersede the main/mcore-dev bump.