Bump `ecdsa` to v0.17.0-pre.8 (#1080) #439

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	30s
build (1.73.0, wasm32-unknown-unknown)	26s
doc	58s
build (stable, thumbv7em-none-eabi)	27s
build (stable, wasm32-unknown-unknown)	20s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	1m 22s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 10s
test (x86_64-unknown-linux-gnu, 1.73.0)	50s
test (x86_64-unknown-linux-gnu, stable)	47s
	6m 50s

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