Bump actions/checkout from 3 to 4 #494

Job	Run time
Clippy	4m 46s
cargo-test (ubuntu-22.04, default, stable)	5m 54s
cargo-build (aarch64-linux-android, ubuntu-22.04)	6m 10s
format	21s
cargo-test (macos-12, default, stable)	7m 34s
cargo-build (armv7-linux-androideabi, ubuntu-22.04)	4m 58s
cargo-test (windows-2019, default, stable)	10m 33s
cargo-build (i686-linux-android, ubuntu-22.04)	5m 50s
cargo-test (ubuntu-22.04, beta)	11m 51s
cargo-build (x86_64-linux-android, ubuntu-22.04)	6m 6s
cargo-test (ubuntu-22.04, blocking)	12m 13s
cargo-build (x86_64-unknown-linux-musl, ubuntu-22.04)	5m 11s
cargo-test (ubuntu-22.04, blocking,beta)	10m 52s
cargo-build (aarch64-apple-ios, macos-12)	5m 44s
cargo-test (ubuntu-22.04, tls-rustls --no-default-features)	10m 29s
cargo-test (ubuntu-22.04, tls-vendored-openssl --no-default-features)	10m 36s
cargo-test (ubuntu-22.04, beta, default)	8m 18s
cargo-test (ubuntu-22.04, 1.67.0, default)	11m 27s
	2h 18m 53s

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