Update to Lightning 1.1.4
This pull request **introduces 1 alert** when merging 73e9a8a210002ac77a8166a176651abbbea1a390 into d8150b41bbba0c2ee2e291b309651cef2ed248bf - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-81dddf30b77cce1659e91a2d505dce40fca10a67)

**new alerts:**

* 1 for Unused import