fix(files_external): Fix registration of listeners with PHP >= 8.4

With the lazy ghosts the constructor is not always called in
 files_external boot. This is a quick and dirty fix but we should
 instead move the code out of the constructors and to the boot method.

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

Author: come-nc

apps/files_external/lib/AppInfo/Application.php

@@ -89,7 +89,11 @@ public function boot(IBootContext $context): void {
 
 		// force-load auth mechanisms since some will register hooks
 		// TODO: obsolete these and use the TokenProvider to get the user's password from the session
-		$this->getAuthMechanisms();
+		$objects = $this->getAuthMechanisms();
+		foreach ($objects as $object) {
+			/* Use the object to trigger DI on PHP >= 8.4 */
+			get_object_vars($object);
+		}
 	}
 
 	/**