Bump Dependency

End-to-end workflow for shipping a dependency bump in Megatron Bridge. Optimised for the case where TE, MCore, or another GPU-heavy pin moves forward — which often surfaces flakes that have to be quarantined before the PR can land.

The pipeline is always: edit → relock → push → /ok to test → watchdog → quarantine on red → re-trigger → repeat until green.

When to reach for this skill

• Bumping a git-source pin in pyproject.toml override-dependencies (e.g. transformer-engine @ git+...@<ref>).
• Bumping the 3rdparty/Megatron-LM submodule.
• Any change that touches uv.lock and needs the full L0 + L1 matrix to prove out before merge.