build(deps-dev): update rector/rector requirement from 2.1.7 to 2.2.1

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@2.1.7...2.2.1)

---
updated-dependencies:
- dependency-name: rector/rector
  dependency-version: 2.2.1
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -33,7 +33,7 @@
         "phpstan/phpstan-strict-rules": "^2.0.4",
         "phpunit/phpcov": "^9",
         "phpunit/phpunit": "^10.4",
-        "rector/rector": "2.1.7"
+        "rector/rector": "2.2.1"
     },
     "minimum-stability": "dev",
     "prefer-stable": true,