Bump actions/checkout from 3 to 4 (#120) #352

Job	Run time
Audit	13s
cargo fmt	13s
cargo clippy	40s
Taplo	6s
Build with no-std on wasm32-unknown-unknown	37s
Build with no-std on wasm32-unknown-unknown	36s
test (--features ristretto255-ciphersuite, stable)	1m 29s
Build with no-std on wasm32-unknown-unknown	38s
test (--features ristretto255-ciphersuite, 1.65.0)	4m 19s
Build with no-std on wasm32-unknown-unknown	42s
test (--features ristretto255-ciphersuite, --features danger, stable)	2m 4s
Build with no-std on wasm32-unknown-unknown	35s
test (--features ristretto255-ciphersuite, --features danger, 1.65.0)	5m 5s
Build with no-std on wasm32-unknown-unknown	48s
test (--features ristretto255-ciphersuite, --features serde, stable)	2m 2s
Build with no-std on thumbv6m-none-eabi	3m 26s
test (--features ristretto255-ciphersuite, --features serde, 1.65.0)	5m 8s
Build with no-std on thumbv6m-none-eabi	26s
test (stable)	1m 23s
Build with no-std on thumbv6m-none-eabi	32s
test (1.65.0)	5m 20s
Build with no-std on thumbv6m-none-eabi	37s
test (--features danger, stable)	3m 22s
Build with no-std on thumbv6m-none-eabi	28s
Build with no-std on thumbv6m-none-eabi	33s
test (--features danger, 1.65.0)	6m 10s
test (--features serde, stable)	1m 57s
test (--features serde, 1.65.0)	4m 56s
	54m 25s

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