Apply review feedback and fix another psalm error

Author: markstory

src/Log/Engine/DebugKitLog.php

@@ -31,7 +31,7 @@ class DebugKitLog extends BaseLog
     /**
      * Captures log messages in memory
      *
-     * @param string $level The type of message being logged.
+     * @param mixed $level The type of message being logged.
      * @param string $message The message being logged.
      * @param array $context Additional context data
      * @return void

tests/TestCase/View/Helper/ToolbarHelperTest.php

@@ -87,7 +87,7 @@ public function testDumpCoerceHtml()
     public function testDumpSorted()
     {
         $getValues = function ($el) {
-            return (string)$el;
+            return strval($el);
         };
         $path = '//*[@class="cake-dbg-array-item"]/*[@class="cake-dbg-string"]';
         $data = ['z' => 1, 'a' => 99, 'm' => 123];