Update actions/setup-python action to v6 (#36) #180

Job	Run time
test wasm bindings	2m 11s
cargo clippy (default)	1m 9s
cargo fmt	15s
cargo clippy (default+python+elgamal3)	58s
cargo clippy (default+legacy)	51s
cargo clippy (default+wasm+elgamal3)	52s
cargo test (default+wasm)	33s
test python bindings	49s
cargo clippy (default+wasm)	1m 1s
cargo test (default+legacy)	20s
cargo clippy (default+python)	54s
cargo test (default+wasm+elgamal3)	35s
cargo clippy (default+elgamal3)	1m 28s
cargo test (default+elgamal3)	26s
cargo test (default)	30s
cargo test (default+python)	1m 14s
cargo test (default+python+elgamal3)	1m 5s
	15m 11s

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