Merge branch '6.1' into 6.2

* 6.1:
  [Console] Fix `Helper::removeDecoration` hyperlink bug
  Guard scripts from being run in non-CLI contexts
  Guard scripts from being run in non-CLI contexts
  [Serializer] fixed traceable decoration priorities
  a readonly property must not be reported as being writable

Author: fabpot

Resources/bin/check-unused-known-tags.php

@@ -9,6 +9,10 @@
  * file that was distributed with this source code.
  */
 
+if ('cli' !== \PHP_SAPI) {
+    throw new Exception('This script must be run from the command line.');
+}
+
 require dirname(__DIR__, 6).'/vendor/autoload.php';
 
 use Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\Compiler\UnusedTagsPassUtils;

Resources/config/serializer_debug.php

@@ -17,7 +17,7 @@
 return static function (ContainerConfigurator $container) {
     $container->services()
         ->set('debug.serializer', TraceableSerializer::class)
-            ->decorate('serializer', null, 255)
+            ->decorate('serializer')
             ->args([
                 service('debug.serializer.inner'),
                 service('serializer.data_collector'),