ci: Use taiki-e/github-actions/checkout action #2790

Job	Run time
miri	55s
test (no rustup)	1m 54s
test (1.26)	7m 59s
test (1.30)	6m 11s
test (stable)	5m 31s
test (1.31)	6m 44s
test (beta)	5m 18s
test (1.36)	7m 23s
test (nightly)	5m 13s
test (1.39)	7m 34s
tidy / tidy	59s
test (nightly, macos-11)	9m 57s
test (1.41)	7m 28s
test (nightly, windows-2019)	8m 25s
deny / deny	13s
msrv / msrv	1m 57s
release-dry-run / prepare	4s
release-dry-run / build (aarch64-unknown-linux-gnu)	1m 12s
release-dry-run / build (aarch64-unknown-linux-musl)	55s
release-dry-run / build (aarch64-apple-darwin, macos-11)	1m 40s
release-dry-run / build (aarch64-pc-windows-msvc, windows-2019)	1m 41s
release-dry-run / build (x86_64-unknown-linux-gnu)	44s
release-dry-run / build (x86_64-unknown-linux-musl)	58s
release-dry-run / build (x86_64-apple-darwin, macos-11)	1m 38s
release-dry-run / build (x86_64-pc-windows-msvc, windows-2019)	2m 17s
release-dry-run / build (x86_64-unknown-freebsd)	1m 20s
release-dry-run / build (universal-apple-darwin, macos-11)	2m 10s
	1h 38m 20s

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