elliptic-curve+signature: bump `digest` to v0.11.0-pre.7 (#1478) #2214

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	2m 7s
test (1.65.0)	2m 20s
build (1.65.0, wasm32-unknown-unknown)	2m 8s
test (stable)	17s
build (stable, thumbv7em-none-eabi)	15s
build (stable, wasm32-unknown-unknown)	10s
	7m 17s

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