Update elliptic-curve and shlex #1075

Job	Run time
lint	17s
sort	35s
build-all-features (stable)	1m 15s
build-all-features (beta)	1m 8s
build (stable)	1m 10s
clippy (stable)	1m 36s
build-all-features (nightly-2023-10-01)	1m 14s
build (beta)	1m 9s
deny (advisories)	40s
clippy (beta)	59s
build (nightly-2023-10-01)	1m 16s
deny (bans licenses sources)	38s
doc (stable)	45s
test (stable)	2m 38s
doc (beta)	51s
test (beta)	2m 28s
build-no-alloc (thumbv6m-none-eabi)	1m 19s
coverage	1m 35s
test (nightly-2023-10-01)	2m 36s
build-no-alloc (thumbv7m-none-eabi)	1m 16s
build-no-alloc (thumbv8m.main-none-eabi)	1m 17s
build-no-alloc (aarch64-linux-android)	1m 20s
build-no-alloc (aarch64-apple-ios)	1m 13s
build-no-alloc (wasm32-unknown-unknown)	1m 15s
	30m 30s

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