ScriptFactory:: should be protected if we're using static

Author: Thomas Kerin

src/Script/ScriptFactory.php

@@ -22,7 +22,11 @@ class ScriptFactory
      * @var OutputScriptFactory
      */
     private static $outputScriptFactory = null;
-    private static $opcodes = null;
+
+    /**
+     * @var Opcodes|null
+     */
+    protected static $opcodes = null;
 
     private static function getOpCodes(): Opcodes
     {