Merge branch '6.4' into 7.0

* 6.4:
  [Mime] Fix lowest versions of deps
  [VarDumper] Fix calling scope detection inside magic accessors
  [Validator] add missing German translations
  fix deprecation versions
  update the Brevo SMTP host
  Remove \ReflectionProperty::setAccessible(true) calls
  [Serializer] Fix denormalizing abstract part headers in MimeMessageNormalizer
  Fix property must not be accessed before initialization on SymfonyRuntime::$input
  [Form] Remove an obsolete phpdoc comment
  [Webhook] Allow slash in webhook type
  Use more "First class callable syntax" + Normalize set_error_handler/set_exception_handler calls
  [FrameworkBundle][Workflow] Throw exception is workflow.xxx.transitions is not an array

Filesystem.php

@@ -721,7 +721,7 @@ private static function box(string $func, mixed ...$args): mixed
         self::assertFunctionExists($func);
 
         self::$lastError = null;
-        set_error_handler(__CLASS__.'::handleError');
+        set_error_handler(self::handleError(...));
         try {
             return $func(...$args);
         } finally {