Update low-level-rustls example - add http2 feature flag (#3179) #5275

Job	Run time
check-docs	29s
check	2m 26s
cargo-hack	3m 16s
cargo-public-api-crates (axum)	59s
cargo-public-api-crates (axum-core)	43s
cargo-deny check (advisories)	25s
dependencies-are-sorted	42s
Spell Check with Typos	3s
cargo-public-api-crates (axum-extra)	50s
cargo-deny check (bans licenses sources)	25s
cargo-public-api-crates (axum-macros)	40s
test-msrv	2m 56s
test-versions (stable)	1m 50s
test-docs	2m 5s
armv5te-unknown-linux-musleabi	37s
test-versions (beta)	4m 7s
test-nightly	1m 42s
wasm32-unknown-unknown	24s
	24m 39s

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