Update rector/rector requirement from ^0.18.0 to ^0.19.0 (#13)

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@0.18.0...0.19.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

composer.json

@@ -36,7 +36,7 @@
     "require-dev": {
         "maglnet/composer-require-checker": "^4.4",
         "phpunit/phpunit": "^9.5",
-        "rector/rector": "^0.18.0",
+        "rector/rector": "^0.19.0",
         "roave/infection-static-analysis-plugin": "^1.16",
         "spatie/phpunit-watcher": "^1.23",
         "vimeo/psalm": "^4.30|^5.11",