Update unix-domain-socket, listen-multiple-addrs, and testing example… #4081

Job	Run time
check	1m 14s
check-docs	35s
cargo-hack	4m 2s
cargo-public-api-crates (axum)	41s
cargo-public-api-crates (axum-core)	28s
cargo-deny check (advisories)	24s
cargo-public-api-crates (axum-extra)	35s
cargo-deny check (bans licenses sources)	26s
dependencies-are-sorted	20s
cargo-public-api-crates (axum-macros)	26s
Spell Check with Typos	7s
test-nightly	2m 1s
test-versions (stable)	2m 52s
test-docs	1m 59s
test-versions (beta)	2m 39s
armv5te-unknown-linux-musleabi	42s
test-msrv	1m 52s
wasm32-unknown-unknown	32s
	21m 55s

Provide feedback