Pass correct argument to rustc -Z ls #4071

Job	Run time
check_features (azure)	43s
check_features (gcs)	55s
coverage ubuntu-22.04 rust nightly	7m 43s
check_features (gha)	33s
clippy ubuntu-latest	1m 17s
coverage macos-13 rust nightly	8m 0s
check_features (memcached)	39s
build sccache x86_64-unknown-linux-musl	6m 9s
clippy macOS-latest	1m 13s
check_features (redis)	54s
build sccache-dist x86_64-unknown-linux-musl	4m 38s
clippy windows-latest	2m 42s
build sccache aarch64-unknown-linux-musl	6m 23s
check_features (s3)	51s
rustfmt ubuntu-latest	12s
check_features (webdav)	39s
build sccache armv7-unknown-linux-musleabi	6m 21s
test ubuntu-20.04 rust 1.75.0	3m 1s
test ubuntu-22.04 rust 1.75.0 dist-server	3m 28s
build sccache i686-unknown-linux-musl	6m 17s
test ubuntu-20.04 rust stable	2m 39s
test freebsd-14.1 rust stable (ubuntu-22.04)	8m 0s
toml_format	13s
build sccache x86_64-apple-darwin	14m 51s
test ubuntu-20.04 rust beta	2m 43s
build sccache aarch64-apple-darwin	6m 52s
test ubuntu-20.04 rust nightly	2m 37s
build sccache x86_64-pc-windows-msvc	15m 27s
test ubuntu-20.04 rust stable no-default-features	1m 49s
build sccache aarch64-pc-windows-msvc	16m 3s
test ubuntu-22.04 rust stable cuda11.8	5m 37s
test ubuntu-24.04 rust 1.75.0 cuda12.6	4m 38s
test macos-13 rust stable	4m 14s
test macos-14 rust stable	2m 45s
test windows-2019 rust 1.75.0 cuda11.8	8m 20s
test windows-2019 rust nightly cuda11.8	9m 51s
test windows-2019 rust beta cuda11.8	9m 23s
test windows-2022 rust 1.75.0 cuda12.6	8m 22s
test windows-2022 rust nightly cuda12.6	8m 47s
test windows-2022 rust beta cuda12.6	8m 43s
release	0s
	3h 24m 32s

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