Use `lockfile-only` for cargo dependabot #1001

Job	Run time
lint	16s
build (stable)	1m 11s
clippy (stable)	55s
build (beta)	1m 25s
build-all-features (stable)	1m 7s
build-no-alloc (thumbv6m-none-eabi)	1m 21s
build-all-features (beta)	1m 19s
clippy (beta)	1m 14s
build (nightly-2023-10-01)	1m 17s
build-no-alloc (thumbv7m-none-eabi)	1m 12s
build-all-features (nightly-2023-10-01)	1m 29s
build-no-alloc (thumbv8m.main-none-eabi)	1m 12s
build-no-alloc (aarch64-linux-android)	1m 14s
coverage	1m 28s
deny (advisories)	37s
build-no-alloc (aarch64-apple-ios)	1m 15s
doc (stable)	44s
deny (bans licenses sources)	42s
build-no-alloc (wasm32-unknown-unknown)	1m 12s
doc (beta)	48s
sort	33s
test (stable)	2m 37s
test (beta)	2m 46s
test (nightly-2023-10-01)	2m 51s
	30m 45s

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