p224

Bump `ecdsa` to v0.17.0-pre.4 #552

Job	Run time
doc	55s
build (1.73.0, thumbv7em-none-eabi)	33s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	53s
build (1.73.0, wasm32-unknown-unknown)	32s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	51s
build (stable, thumbv7em-none-eabi)	23s
build (stable, wasm32-unknown-unknown)	24s
test (x86_64-unknown-linux-gnu, 1.73.0)	37s
test (x86_64-unknown-linux-gnu, stable)	31s
	5m 39s

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