Bump actions/checkout from 3 to 4 (#302) #496

Job	Run time
Clippy	6m 15s
format	12s
cargo-test (ubuntu-22.04, default, stable)	7m 41s
cargo-test (macos-12, default, stable)	7m 8s
cargo-build (aarch64-linux-android, ubuntu-22.04)	5m 15s
cargo-test (windows-2019, default, stable)	11m 15s
cargo-build (armv7-linux-androideabi, ubuntu-22.04)	5m 3s
cargo-test (ubuntu-22.04, beta)	11m 38s
cargo-build (i686-linux-android, ubuntu-22.04)	5m 56s
cargo-test (ubuntu-22.04, blocking)	11m 9s
cargo-build (x86_64-linux-android, ubuntu-22.04)	4m 55s
cargo-test (ubuntu-22.04, blocking,beta)	10m 39s
cargo-build (x86_64-unknown-linux-musl, ubuntu-22.04)	5m 33s
cargo-test (ubuntu-22.04, tls-rustls --no-default-features)	9m 48s
cargo-build (aarch64-apple-ios, macos-12)	3m 53s
cargo-test (ubuntu-22.04, tls-vendored-openssl --no-default-features)	11m 8s
cargo-test (ubuntu-22.04, beta, default)	9m 40s
cargo-test (ubuntu-22.04, 1.67.0, default)	12m 40s
	2h 19m 48s

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