k256: update `Signature::normalize_s` usages (#1017) #232

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	22s
build (1.73.0, wasm32-unknown-unknown)	22s
build (stable, thumbv7em-none-eabi)	25s
build (stable, wasm32-unknown-unknown)	20s
cross (armv7-unknown-linux-gnueabihf, 1.73.0)	1m 45s
doc	59s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	1m 39s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 53s
cross (aarch64-unknown-linux-gnu, 1.73.0)	1m 26s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 37s
cross (aarch64-unknown-linux-gnu, stable)	1m 13s
test (x86_64-unknown-linux-gnu, 1.73.0)	1m 6s
test (x86_64-unknown-linux-gnu, stable)	56s
cross (powerpc-unknown-linux-gnu, 1.73.0)	1m 37s
cross (powerpc-unknown-linux-gnu, stable)	1m 29s
	17m 9s

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