Prefer core::num::NonZero over crypto_bigint::NonZero where possible … #218

Job	Run time
clippy	2m 19s
build-wasm (1.81.0, wasm32-unknown-unknown)	17s
build-benchmarks	2m 40s
build-wasm (stable, wasm32-unknown-unknown)	20s
cargo-careful	1m 39s
codecov	47s
rustfmt	6s
slow-tests (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	2m 33s
tests (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	54s
slow-tests (x86_64-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	3m 6s
tests (x86_64-unknown-linux-gnu, stable)	40s
	15m 21s

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