Bump `ecdsa` to v0.17.0-pre.8 #336

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	22s
cross (armv7-unknown-linux-gnueabihf, 1.73.0)	1m 42s
build (1.73.0, wasm32-unknown-unknown)	19s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 33s
build (stable, thumbv7em-none-eabi)	15s
doc	52s
cross (aarch64-unknown-linux-gnu, 1.73.0)	1m 27s
build (stable, wasm32-unknown-unknown)	13s
cross (aarch64-unknown-linux-gnu, stable)	1m 10s
cross (powerpc-unknown-linux-gnu, 1.73.0)	1m 28s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	1m 34s
cross (powerpc-unknown-linux-gnu, stable)	1m 15s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 33s
test (x86_64-unknown-linux-gnu, 1.73.0)	1m 13s
test (x86_64-unknown-linux-gnu, stable)	1m 7s
	16m 3s

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