workflows: update `actions/checkout` to v4 #177

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Run time

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Job	Run time
Rerun pre-commit checks	19s
Docs	14s
Windows (3.8, x86)	1m 47s
Tests (ubuntu-latest, 3.8)	19s
Windows (3.8, x64)	1m 46s
Tests (ubuntu-latest, 3.9)	25s
Windows (3.9, x86)	2m 47s
Tests (ubuntu-latest, 3.10)	22s
Windows (3.9, x64)	2m 12s
Tests (ubuntu-latest, 3.11)	21s
Windows (3.10, x86)	1m 46s
Tests (macos-latest, 3.8)	50s
Tests (macos-latest, 3.9)	47s
Windows (3.10, x64)	1m 4s
Tests (macos-latest, 3.10)	52s
Windows (3.11, x86)	3m 50s
Tests (macos-latest, 3.11)	47s
Windows (3.11, x64)	1m 49s
	22m 17s