fix: ensure callNodeListener resolves after res.end() is called

[kricsleo]

resolves #779

This is a minimal quick fix for h3@v1. (I'm not sure if it still needs fixing, though 🤔)

The res.once binding was happening too late. Sometimes, res.end() would be called and the events would have already fired, preventing the callbacks from firing. This would cause the response to hang indefinitely.

The WIP h3@2 doesn't need this fix because it binds earlier:

h3/src/adapters.ts

Lines 75 to 80 in ac609aa

	return new Promise((resolve, reject) => {
	res.once("close", () => resolve(kHandled));
	res.once("finish", () => resolve(kHandled));
	res.once("pipe", () => resolve(kHandled));
	res.once("error", (error) => reject(error));
	try {