Update elliptic-curve and shlex #1065

Job	Run time
lint	20s
build (stable)	1m 8s
build (beta)	1m 10s
build (nightly-2023-10-01)	1m 11s
clippy (stable)	53s
clippy (beta)	1m 12s
deny (advisories)	40s
deny (bans licenses sources)	37s
doc (stable)	50s
doc (beta)	48s
build-all-features (stable)	1m 29s
sort	36s
build-all-features (beta)	1m 15s
test (stable)	1m 27s
build-all-features (nightly-2023-10-01)	1m 19s
test (beta)	1m 29s
test (nightly-2023-10-01)	1m 44s
build-no-alloc (thumbv6m-none-eabi)	1m 21s
coverage	1m 20s
build-no-alloc (thumbv7m-none-eabi)	1m 18s
build-no-alloc (thumbv8m.main-none-eabi)	1m 17s
build-no-alloc (aarch64-linux-android)	1m 19s
build-no-alloc (aarch64-apple-ios)	1m 23s
build-no-alloc (wasm32-unknown-unknown)	1m 10s
	27m 16s

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