Bump actions/checkout from 3.6.0 to 4.1.1 #432

Job	Run time
Python 3.6 on macOS	3m 23s
Python 3.6 on Windows x86	5m 27s
Linux docs	2m 30s
Python 3.7 on Windows x86	3m 53s
Python 3.12 on macOS	3m 56s
Linux meta	2m 7s
Python 3.8 on Windows x86	3m 31s
Python 3.12 (minimal build) on macOS	5m 52s
Linux mypy	2m 25s
Python 3.9 on Windows x86	3m 32s
Linux pypy3	4m 25s
Python 3.10 on Windows x86	3m 46s
Linux pypy3	3m 42s
Python 3.11 on Windows x86	3m 49s
Linux py36	2m 39s
Python 3.12 on Windows x86	4m 30s
Linux py37	2m 43s
Python 3.6 on Windows x64	3m 23s
Linux py38	2m 46s
Python 3.7 on Windows x64	3m 27s
Linux py39	2m 7s
Python 3.8 on Windows x64	3m 19s
Linux py310	2m 32s
Python 3.9 on Windows x64	3m 16s
Linux py311	2m 1s
Python 3.10 on Windows x64	3m 27s
Linux py312	2m 46s
Python 3.11 on Windows x64	2m 47s
Linux py312 system	2m 39s
Python 3.12 on Windows x64	3m 49s
Linux py312 minimal	2m 40s
	1h 43m 9s

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