chore(deps-dev): update rector/rector requirement (#10045)

Updates the requirements on [rector/rector](https://github.com/rectorphp/rector) to permit the latest version.

Updates `rector/rector` to 2.3.9
- [Release notes](https://github.com/rectorphp/rector/releases)
- [Commits](rectorphp/rector@2.3.8...2.3.9)

---
updated-dependencies:
- dependency-name: rector/rector
  dependency-version: 2.3.9
  dependency-type: direct:development
  dependency-group: composer-dependencies
...

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

Author: dependabot[bot]

composer.json

@@ -28,7 +28,7 @@
         "phpunit/phpcov": "^9.0.2 || ^10.0",
         "phpunit/phpunit": "^10.5.16 || ^11.2",
         "predis/predis": "^3.0",
-        "rector/rector": "2.3.8",
+        "rector/rector": "2.3.9",
         "shipmonk/phpstan-baseline-per-identifier": "^2.0"
     },
     "replace": {