p192

Bump `ecdsa` to v0.17.0-pre.4 #347

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	28s
build (1.73.0, wasm32-unknown-unknown)	27s
doc	1m 3s
build (stable, thumbv7em-none-eabi)	21s
build (stable, wasm32-unknown-unknown)	19s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	54s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	54s
test (x86_64-unknown-linux-gnu, 1.73.0)	35s
test (x86_64-unknown-linux-gnu, stable)	29s
	5m 30s

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