rpc server: fix host filter for localhost on ipv6 #13561

Job	Run time
check-dependency-rules	11s
check-fail-ci	15s
check-markdown	13s
check-workspace	33s
preflight / preflight	36s
preflight / ci-versions	1m 13s
check-rust-feature-propagation	2m 23s
fmt	1m 33s
check-toml-format	1m 18s
check-umbrella	2m 30s
test-rust-features	2m 14s
All quick checks passed	2s
	13m 1s

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