Set Lightning log level to ERROR

[tizianocitro]

I want to disable logs such as:

💡 Tip: For seamless cloud uploads and versioning, try installing [litmodels](https://pypi.org/project/litmodels/) to enable LitModelCheckpoint, which syncs automatically with the Lightning model registry.
GPU available: True (mps), used: True
TPU available: False, using: 0 TPU cores