build(dev-deps): update rector/rector requirement from 0.12.* || ^0.9…

….19 || ^0.8 to 0.12.* || ^0.9.19 || ^0.8 || ^0.18

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](https://github.com/rectorphp/rector/commits/0.18.0)

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

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

composer.json

@@ -32,7 +32,7 @@
     "nelson6e65/phpdoc-vuepress": "^1.0",
     "phpstan/phpstan": "^1.4.2 || ^0.12.69",
     "composer/composer": "^2.0",
-    "rector/rector": "0.12.* || ^0.9.19 || ^0.8",
+    "rector/rector": "0.12.* || ^0.9.19 || ^0.8 || ^0.18",
     "nelson6e65/code-sniffer-helpers": "^1.0"
   },
   "autoload": {