chore: tidy up laminas 2.5 compatability code (#86)

module/Permits/src/Permits/Data/Mapper/MapperManager.php

@@ -4,14 +4,13 @@
 
 use Common\Data\Mapper\MapperInterface;
 use Laminas\ServiceManager\AbstractPluginManager;
-use Psr\Container\ContainerInterface;
 
 class MapperManager extends AbstractPluginManager
 {
     protected $instanceOf = MapperInterface::class;
 
     /**
-     * Validate a plugin (Laminas 3.0+)
+     * Validate a plugin
      *
      * Checks that the mapper is an instance of MapperInterface.
      *
@@ -30,17 +29,4 @@ public function validate($plugin)
             is_object($plugin) ? get_class($plugin) : gettype($plugin)
         ));
     }
-
-    /**
-     * Validate a plugin (Laminas 2.5)
-     *
-     * Checks that the mapper is an instance of MapperInterface.
-     *
-     * @param  mixed $plugin
-     * @throws \RuntimeException if invalid
-     */
-    public function validatePlugin($plugin)
-    {
-        $this->validate($plugin);
-    }
 }