Bump `ecdsa` to v0.17.0-pre.8 (#1080) #723

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	22s
build (1.73.0, wasm32-unknown-unknown)	24s
doc	35s
build (stable, thumbv7em-none-eabi)	15s
test (1.73.0)	24s
build (stable, wasm32-unknown-unknown)	13s
test (stable)	22s
	2m 35s

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