chore(beep boop 🤖): Bump `MCORE_TAG=c1cafa1...` (2025-01-15)
🚀 PR to bump `NVIDIA/Megatron-LM` in `Dockerfile.ci` to `MCORE_TAG=c1cafa1c19f9b7a014a0bc11c1ddbc13f739f086`.  

📝 Please remember the following to-do's before merge: 
- [ ] Verify the presubmit CI  

🙏 Please merge this PR only if the CI workflow completed successfully.