chore(beep boop 🤖): Bump `MCORE_TAG=1115e06...` (2024-12-02)
🚀 PR to bump `NVIDIA/Megatron-LM` in `Dockerfile.ci` to `MCORE_TAG=1115e06261278b1e2f8f188ab2926d327707853f`.  

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

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