message: [cli] Use "127.0.0.1" instead of "localhost" in `vc dev`
  Node.js doesn't like when a hostname resolves to an IPv6 address (https://stackoverflow.com/a/15244890/376773) so use the IPv4 localhost IP address instead. Specifically this fixes vc dev on Node.js 17 which now prefers IPv6 by default.
  Slack thread:
diff: @@ -968,7 +968,7 @@ export default class DevServer {
  socket.destroy();
  return;
  }
  - const target = `http://localhost:${this.devProcessPort}`;
  + const target = `http://127.0.0.1:${this.devProcessPort}`;
  this.output.debug(`Detected "upgrade" event, proxying to ${target}`);
  this.proxy.ws(req, socket, head, { target });
  });
  @@ -1663,7 +1663,7 @@ export default class DevServer {
  if (!match) {
  // If the dev command is started, then proxy to it
  if (this.devProcessPort) {
  - const upstream = `http://localhost:${this.devProcessPort}`;
  + const upstream = `http://127.0.0.1:${this.devProcessPort}`;
  debug(`Proxying to frontend dev server: ${upstream}`);
  // Add the Vercel platform proxy request headers
  @@ -1810,7 +1810,7 @@ export default class DevServer {
  return proxyPass(
  req,
  res,
  - `http://localhost:${port}`,
  + `http://127.0.0.1:${port}`,
  this,
  requestId,
  false
  @@ -1847,7 +1847,7 @@ export default class DevServer {
  return proxyPass(
  req,
  res,
  - `http://localhost:${this.devProcessPort}`,
  + `http://127.0.0.1:${this.devProcessPort}`,
  this,
  requestId,
  false
  