refactor: simplify listen() API in examples #8

Job	Run time
Test (freebsd-x64)	3m 25s
Test (windows-x64)	50s
Test (macos-x64)	43s
Test (macos-arm64)	44s
Test (ubuntu)	24s
Cross-compile (x86_64-macos-none)	17s
Test (amazonlinux)	1m 9s
Test (arch)	39s
Test (fedora)	43s
Cross-compile (aarch64-macos-none)	17s
Test (ubuntu-arm64)	38s
Cross-compile (x86_64-linux-gnu)	19s
Test (alpine)	38s
Cross-compile (x86_64-freebsd)	14s
Cross-compile (x86_64-windows-gnu)	14s
Cross-compile (aarch64-linux-gnu)	26s
	11m 40s

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