Bump `ecdsa` to v0.17.0-pre.4 #916

Job	Run time
benches (stable)	1m 5s
build (1.73.0, thumbv7em-none-eabi)	20s
build (1.73.0, wasm32-unknown-unknown)	19s
build (stable, thumbv7em-none-eabi)	20s
doc	1m 3s
build (stable, wasm32-unknown-unknown)	17s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	1m 53s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 40s
test (x86_64-unknown-linux-gnu, 1.73.0)	1m 26s
test (x86_64-unknown-linux-gnu, stable)	1m 17s
	9m 40s

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