dsa

Bump `signature` to v2.3.0-pre.0; MSRV 1.71 #514

Job	Run time
build (thumbv7em-none-eabi, 1.71.0)	23s
build (thumbv7em-none-eabi, stable)	18s
build (wasm32-unknown-unknown, 1.71.0)	22s
test (ubuntu-latest, 1.71.0)	39s
build (wasm32-unknown-unknown, stable)	14s
test (ubuntu-latest, stable)	38s
test (macos-latest, 1.71.0)	2m 0s
test (macos-latest, stable)	1m 21s
test (windows-latest, 1.71.0)	1m 13s
test (windows-latest, stable)	1m 31s
	8m 39s

Provide feedback