Update actions/checkout action to v6 (#34) #178

Job	Run time
test python bindings	46s
cargo fmt	14s
test wasm bindings	1m 54s
cargo test (default+legacy)	1m 6s
cargo clippy (default+wasm+elgamal3)	55s
cargo clippy (default+python+elgamal3)	56s
cargo test (default)	55s
cargo clippy (default)	56s
cargo clippy (default+elgamal3)	58s
cargo test (default+python+elgamal3)	1m 5s
cargo clippy (default+legacy)	1m 23s
cargo clippy (default+python)	1m 18s
cargo clippy (default+wasm)	1m 37s
cargo test (default+python)	1m 9s
cargo test (default+elgamal3)	56s
cargo test (default+wasm+elgamal3)	1m 5s
cargo test (default+wasm)	1m 7s
	18m 20s

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