Update rector/rector requirement from ^0.15 to ^0.16

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@0.15.0...0.16.0)

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

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

composer.json

@@ -40,7 +40,7 @@
         "phpstan/phpstan-phpunit": "^1.0",
         "phpstan/phpstan-strict-rules": "^1.0",
         "phpunit/phpunit": "^9.0",
-        "rector/rector": "^0.15",
+        "rector/rector": "^0.16",
         "symfony/framework-bundle": "^5.3|^6.0",
         "symfony/phpunit-bridge": "^5.3|^6.0",
         "symplify/easy-coding-standard": "^11.0"