Update rector/rector requirement from ^1.0 to ^2.0 (#109)

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@1.0.0...2.0.3)

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

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Author: dependabot[bot]

composer.json

@@ -28,7 +28,7 @@
   "require-dev": {
     "ext-iconv": "*",
     "phpunit/phpunit": "^11.2.8",
-    "rector/rector": "^1.0",
+    "rector/rector": "^2.0",
     "roave/security-advisories": "dev-latest",
     "symplify/easy-coding-standard": "^12.1"
   },