Bump actions/checkout from 4.2.0 to 4.2.1 #533

Job	Run time
Linux docs	1m 15s
Linux meta	1m 10s
Linux mypy	1m 2s
Python 3.7 on macos-13	3m 39s
Python 3.13-dev on macos-13	4m 8s
Linux pypy3	2m 53s
Python 3.13-dev (minimal build) on macos-13	3m 41s
Linux pypy3	2m 46s
Python 3.7 on Windows x86	2m 45s
Python 3.13-dev on macos-latest	2m 31s
Linux py37	2m 19s
Python 3.8 on Windows x86	2m 10s
Python 3.13-dev (minimal build) on macos-latest	1m 53s
Linux py38	1m 45s
Python 3.9 on Windows x86	2m 21s
Linux py39	1m 49s
Python 3.10 on Windows x86	2m 50s
Linux py310	1m 53s
Python 3.11 on Windows x86	2m 37s
Linux py311	1m 41s
Python 3.12 on Windows x86	2m 30s
Linux py312	1m 47s
Python 3.13-dev on Windows x86	3m 5s
Linux py313	1m 57s
Python 3.7 on Windows x64	1m 52s
Linux py313 system	2m 40s
Python 3.8 on Windows x64	2m 15s
Linux py313 minimal	1m 52s
Python 3.9 on Windows x64	2m 0s
Python 3.10 on Windows x64	2m 16s
Python 3.11 on Windows x64	2m 11s
Python 3.12 on Windows x64	1m 57s
Python 3.13-dev on Windows x64	2m 21s
	1h 15m 51s

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