Bump `ecdsa` to v0.17.0-pre.4 #628

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	18s
build (1.73.0, wasm32-unknown-unknown)	21s
doc	46s
build (stable, thumbv7em-none-eabi)	13s
build (stable, wasm32-unknown-unknown)	22s
test (1.73.0)	26s
test (stable)	22s
	2m 48s

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