fix environment panel not working with CakePHP 5.1

Author: LordSimal

src/Panel/EnvironmentPanel.php

@@ -90,8 +90,13 @@ protected function _prepare(): array
         $var = get_defined_constants(true);
         $return['app'] = array_diff_key($var['user'], $return['cake'], $hiddenCakeConstants);
 
+        $includePaths = $this->_debug->includePaths();
+        foreach ($includePaths as $k => $v) {
+            $includePaths[$k] = Debugger::exportVarAsNodes($v);
+        }
+
         // Included files data
-        $return['includePaths'] = $this->_debug->includePaths();
+        $return['includePaths'] = $includePaths;
         $return['includedFiles'] = $this->prepareIncludedFiles();
 
         return $return;