Update elliptic-curve and shlex #1066

Job	Run time
lint	18s
build-all-features (stable)	1m 10s
build-all-features (beta)	1m 22s
build (stable)	1m 8s
deny (advisories)	38s
build-all-features (nightly-2023-10-01)	1m 14s
clippy (stable)	54s
deny (bans licenses sources)	39s
clippy (beta)	59s
build (beta)	1m 10s
doc (stable)	48s
sort	36s
build (nightly-2023-10-01)	1m 14s
doc (beta)	50s
test (stable)	1m 25s
test (beta)	1m 27s
test (nightly-2023-10-01)	1m 44s
build-no-alloc (thumbv6m-none-eabi)	1m 18s
coverage	1m 18s
build-no-alloc (thumbv7m-none-eabi)	1m 16s
build-no-alloc (thumbv8m.main-none-eabi)	1m 12s
build-no-alloc (aarch64-linux-android)	1m 15s
build-no-alloc (aarch64-apple-ios)	1m 16s
build-no-alloc (wasm32-unknown-unknown)	1m 13s
	26m 24s

Provide feedback