update low-level-rustls example #4990

Job	Run time
check-docs	32s
cargo-hack	5m 40s
cargo-public-api-crates (axum)	34s
check	2m 12s
cargo-public-api-crates (axum-core)	20s
cargo-deny check (advisories)	31s
cargo-public-api-crates (axum-extra)	28s
cargo-deny check (bans licenses sources)	31s
dependencies-are-sorted	39s
cargo-public-api-crates (axum-macros)	18s
Spell Check with Typos	6s
test-msrv	2m 33s
armv5te-unknown-linux-musleabi	56s
test-docs	1m 34s
test-nightly	1m 35s
test-versions (stable)	3m 12s
wasm32-unknown-unknown	28s
test-versions (beta)	3m 59s
	26m 8s

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