fix: Configure the printer PHP version to 5.3 by default

See the discussion in nikic/PHP-Parser#1007.

src/PhpParser/Printer/StandardPrinterFactory.php

@@ -23,7 +23,7 @@ public function createPrinter(?PhpVersion $phpVersion = null): Printer
     {
         return new StandardPrinter(
             new Standard([
-                'phpVersion' => $phpVersion,
+                'phpVersion' => $phpVersion ?? PhpVersion::fromComponents(5, 3),
             ]),
         );
     }