Update rector/rector requirement from ^0.12.19 to ^0.13.6

Updates the requirements on [rector/rector](https://github.com/rectorphp/rector) to permit the latest version.
- [Release notes](https://github.com/rectorphp/rector/releases)
- [Commits](rectorphp/rector@0.12.19...0.13.6)

---
updated-dependencies:
- dependency-name: rector/rector
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -52,7 +52,7 @@
         "symfony/swiftmailer-bundle": "^3.1",
         "symfony/twig-bundle": "^5.4",
         "vimeo/psalm": "^4.22",
-        "rector/rector": "^0.12.19"
+        "rector/rector": "^0.13.6"
     },
     "extra": {
         "branch-alias": {