[K6.3] Remove two parts deprecated

src/libraries/kunena/src/Controller/KunenaControllerBase.php

@@ -102,7 +102,7 @@ protected function loadApplication(): CMSApplicationInterface
      */
     protected function loadInput(): Input
     {
-        return $this->app->input;
+        return $this->app->getInput();
     }
 
     /**

src/libraries/kunena/src/Database/KunenaDatabaseObject.php

@@ -20,6 +20,7 @@
 use Joomla\CMS\Object\CMSObject;
 use Joomla\CMS\Plugin\PluginHelper;
 use Joomla\CMS\Table\Table;
+use Joomla\Database\DatabaseInterface;
 use Kunena\Forum\Libraries\Exception\KunenaException;
 
 /**
@@ -166,7 +167,15 @@ public function load($id = null): bool
      */
     protected function getTable()
     {
-        $table = Table::getInstance($this->_table, 'Kunena\Forum\Libraries\Tables\Table');
+       $className = 'Kunena\Forum\Libraries\Tables\\' . $this->_table;
+       $db = Factory::getContainer()->get(DatabaseInterface::class);
+
+       if (class_exists($className)) {
+           $table = new $className($db);
+       } else {
+           $className = 'Kunena\Forum\Libraries\Tables\Table' . $this->_table;
+           $table = new $className($db);
+       }
 
         return $table;
     }