Merge branch '6.4' into 7.0

* 6.4:
  [Filesystem] Fix str_contains deprecation
  [Security] Correctly initialize the voter property
  [ErrorHandler] Skip failing tests when "xdebug.file_link_format" option is defined
  [FrameworkBundle] Fix typo
  Update `changed-translation-files` step with native git diff command
  [DependencyInjection] fix XmlDumper when a tag contains also a 'name' property
  [Lock] Check the correct SQLSTATE error code for MySQL
  [ErrorHandler] Fix `ErrorHandlerTest::tearDown()` visibility
  [Lock] compatiblity with redis cluster 7
  fix: typo
  [Messenger] trigger retry logic when message is a redelivery
  [PropertyAccess] Fix checking for missing properties
  add missing invalid extension error entry

Author: derrabus

Constraints/File.php

@@ -38,6 +38,7 @@ class File extends Constraint
         self::EMPTY_ERROR => 'EMPTY_ERROR',
         self::TOO_LARGE_ERROR => 'TOO_LARGE_ERROR',
         self::INVALID_MIME_TYPE_ERROR => 'INVALID_MIME_TYPE_ERROR',
+        self::INVALID_EXTENSION_ERROR => 'INVALID_EXTENSION_ERROR',
         self::FILENAME_TOO_LONG => 'FILENAME_TOO_LONG',
     ];