chore(beep boop 🤖): Bump `MCORE_TAG=f5afc25...` (2024-11-27)
🚀 PR to bump `NVIDIA/Megatron-LM` in `Dockerfile.ci` to `MCORE_TAG=f5afc251e7881ffa3a58f3184b4fb0fc4e8ec8ef`.  

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

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