Bump actions/checkout from 3 to 4 #1883

Job	Run time
python 3.9 - Lint	2m 29s
GPU Tests	14m 58s
python 3.9 - Type check	5m 3s
python 3.9 - Build	2m 26s
python 3.9 - Style	19s
python 3.9 - Docs	2m 49s
python 3.9 - Test	2m 49s
python 3.9 - Datasets integration	24s
python 3.9 - PyTorch integration	36s
python 3.9 - Transformers integration	2m 46s
python 3.9 - FairScale integration	37s
python 3.9 - W&B integration	7m 17s
python 3.9 - Beaker integration	10m 0s
python 3.9 - Flax integration	4m 28s
python 3.9 - GS integration	45s
python 3.9 - Example - train_lm	2m 31s
python 3.8 - Test	3m 14s
python 3.10 - Test	3m 11s
Release	0s
	1h 6m 42s

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