chore(beep boop 🤖): Bump `MCORE_TAG=d3c585e...` (2024-12-22)
🚀 PR to bump `NVIDIA/Megatron-LM` in `Dockerfile.ci` to `MCORE_TAG=d3c585e90ebd5937243c8d4c9d5d5cf9d61665d6`.  

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

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