minor #21678 [Yaml] fix DUMP_EMPTY_ARRAY_AS_SEQUENCE flag value (xabbuh)

This PR was merged into the 3.3-dev branch.

Discussion
----------

[Yaml] fix DUMP_EMPTY_ARRAY_AS_SEQUENCE flag value

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Commits
-------

3953d76 fix DUMP_EMPTY_ARRAY_AS_SEQUENCE flag value

src/Symfony/Component/Yaml/Yaml.php

@@ -29,7 +29,7 @@ class Yaml
     const DUMP_OBJECT_AS_MAP = 64;
     const DUMP_MULTI_LINE_LITERAL_BLOCK = 128;
     const PARSE_CONSTANT = 256;
-    const DUMP_EMPTY_ARRAY_AS_SEQUENCE = 512;
+    const DUMP_EMPTY_ARRAY_AS_SEQUENCE = 1024;
 
     /**
      * @experimental in version 3.3