fix: add Closure signature for CodeIgniter::$controller

Author: paulbalandan

phpstan-baseline.php

@@ -186,11 +186,6 @@
 	'count' => 6,
 	'path' => __DIR__ . '/system/CodeIgniter.php',
 ];
-$ignoreErrors[] = [
-	'message' => '#^Property CodeIgniter\\\\CodeIgniter\\:\\:\\$controller type has no signature specified for Closure\\.$#',
-	'count' => 1,
-	'path' => __DIR__ . '/system/CodeIgniter.php',
-];
 $ignoreErrors[] = [
 	'message' => '#^Construct empty\\(\\) is not allowed\\. Use more strict comparison\\.$#',
 	'count' => 1,

system/CodeIgniter.php

@@ -108,7 +108,7 @@ class CodeIgniter
     /**
      * Controller to use.
      *
-     * @var Closure|string
+     * @var (Closure(mixed...): ResponseInterface|string)|string
      */
     protected $controller;