Update rector/rector requirement from 2.3.9 to 2.4.0 (#79)

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@2.3.9...2.4.0)

---
updated-dependencies:
- dependency-name: rector/rector
  dependency-version: 2.4.0
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Alessandro Lai <alessandro.lai85@gmail.com>

Author: dependabot[bot]

composer.json

@@ -44,7 +44,7 @@
         "phpstan/phpstan-phpunit": "2.0.16",
         "phpunit/phpunit": "^10 || ^11 || ^12",
         "psalm/plugin-phpunit": "0.19.3",
-        "rector/rector": "2.3.9",
+        "rector/rector": "2.4.0",
         "shipmonk/composer-dependency-analyser": "^1.8",
         "symfony/phpunit-bridge": "^6.4 || ^7.0 || ^8.0",
         "symfony/process": "^6.4 || ^7.0 || ^8.0",