[feature/dic] Move cron.lock_db into DIC

PHPBB3-10739

phpBB/config/services.yml

@@ -114,3 +114,10 @@ services:
         arguments:
             - @cron.task_provider
             - @cache.driver
+
+    cron.lock_db:
+        class: phpbb_lock_db
+        arguments:
+            - cron_lock
+            - @config
+            - @dbal.conn

phpBB/cron.php

@@ -71,7 +71,7 @@ else
 	output_image();
 }
 
-$cron_lock = new phpbb_lock_db('cron_lock', $config, $db);
+$cron_lock = $container->get('cron.lock_db');
 if ($cron_lock->acquire())
 {
 	if ($config['use_system_cron'])