k256: refactored `lincomb` to use `LinearCombinationExt` trait (#974) #162

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	3m 38s
cross (armv7-unknown-linux-gnueabihf, 1.65.0)	4m 45s
build (1.65.0, wasm32-unknown-unknown)	3m 42s
doc	12s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 14s
build (stable, thumbv7em-none-eabi)	20s
test (i686-unknown-linux-gnu, 1.65.0, sudo apt update && sudo apt install gcc-multilib)	5m 13s
cross (aarch64-unknown-linux-gnu, 1.65.0)	4m 47s
build (stable, wasm32-unknown-unknown)	19s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 9s
cross (aarch64-unknown-linux-gnu, stable)	1m 10s
test (x86_64-unknown-linux-gnu, 1.65.0)	4m 28s
cross (powerpc-unknown-linux-gnu, 1.65.0)	4m 43s
test (x86_64-unknown-linux-gnu, stable)	50s
cross (powerpc-unknown-linux-gnu, stable)	1m 10s
	37m 40s

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