litep2p/discovery: Fix memory leak in `litep2p.public_addresses()` #11013

Job	Run time
check-dependency-rules	10s
check-fail-ci	10s
check-markdown	13s
check-workspace	23s
preflight / preflight	1m 24s
preflight / ci-versions	54s
test-rust-features	1m 55s
check-rust-feature-propagation	2m 3s
check-toml-format	55s
check-umbrella	2m 13s
fmt	1m 8s
All quick checks passed	1s
	11m 29s

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