php bin/console server:start --help
Дает информацию, которую вы хотите
Usage:
server:start [options] [--] [<addressport>]
Arguments:
addressport The address to listen to (can be address:port, address, or port)
Так введите
Change the default address and port by passing them as an argument:
php bin/console server:start 127.0.0.1:8080