Bump actions/checkout from 3.6.0 to 4.1.6 #455

Job	Run time
Python 3.6 on macOS	8s
Linux docs	1m 14s
Python 3.12 on macOS	53s
Python 3.6 on Windows x86	3m 20s
Linux meta	1m 13s
Python 3.12 (minimal build) on macOS	1s
Python 3.7 on Windows x86	3m 6s
Linux mypy	1m 2s
Python 3.8 on Windows x86	3m 5s
Linux pypy3	2m 47s
Linux pypy3	2m 51s
Python 3.9 on Windows x86	3m 2s
Linux py36	1m 49s
Python 3.10 on Windows x86	2m 7s
Linux py37	1m 48s
Python 3.11 on Windows x86	3m 15s
Linux py38	1m 47s
Python 3.12 on Windows x86	3m 19s
Linux py39	1m 48s
Python 3.6 on Windows x64	2m 49s
Linux py310	1m 52s
Python 3.7 on Windows x64	2m 22s
Linux py311	1m 45s
Python 3.8 on Windows x64	1m 52s
Linux py312	1m 52s
Python 3.9 on Windows x64	2m 27s
Python 3.10 on Windows x64	2m 18s
Linux py312 system	2m 20s
Python 3.11 on Windows x64	2m 14s
Linux py312 minimal	1m 44s
Python 3.12 on Windows x64	2m 39s
	1h 4m 49s

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