dont cache ondemand loggers

Author: taylorotwell

src/Illuminate/Log/LogManager.php

@@ -127,6 +127,10 @@ public function getChannels()
     protected function get($name, ?array $config = null)
     {
         try {
+            if ($name === 'ondemand' && ! empty($config)) {
+                unset($this->channels['ondemand']);
+            }
+
             return $this->channels[$name] ?? with($this->resolve($name, $config), function ($logger) use ($name) {
                 return $this->channels[$name] = $this->tap($name, new Logger($logger, $this->app['events']));
             });