Bump actions/checkout from 3.6.0 to 4.1.5 #453

Job	Run time
Linux docs	1m 17s
Linux meta	1m 9s
Linux mypy	1m 9s
Linux pypy3	2m 41s
Linux pypy3	2m 40s
Linux py36	1m 53s
Python 3.6 on macOS	11s
Linux py37	1m 45s
Python 3.12 on macOS	32s
Linux py38	1m 42s
Python 3.6 on Windows x86	2m 54s
Python 3.12 (minimal build) on macOS	32s
Linux py39	1m 49s
Python 3.7 on Windows x86	2m 54s
Linux py310	1m 51s
Python 3.8 on Windows x86	2m 54s
Linux py311	1m 44s
Linux py312	1m 46s
Python 3.9 on Windows x86	3m 9s
Linux py312 system	4m 20s
Linux py312 minimal	1m 41s
Python 3.10 on Windows x86	3m 8s
Python 3.11 on Windows x86	3m 5s
Python 3.12 on Windows x86	2m 47s
Python 3.6 on Windows x64	2m 37s
Python 3.7 on Windows x64	2m 27s
Python 3.8 on Windows x64	2m 9s
Python 3.9 on Windows x64	2m 32s
Python 3.10 on Windows x64	1m 52s
Python 3.11 on Windows x64	2m 8s
Python 3.12 on Windows x64	2m 32s
	1h 5m 50s

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