CI: upgrade `actions/checkout` #1230

Job	Run time
bench (1.22)	2m 39s
build-wasm (1.22)	18s
test-386 (1.22)	26s
test (1.22, windows-latest)	7m 7s
test (1.22, macos-latest)	1m 33s
test-benchmarks (1.22)	3m 39s
torrentfs-linux (1.22, ubuntu-latest)	5m 13s
test (1.22, ubuntu-latest)	57s
	21m 52s

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