[TASK] Update rector/rector requirement from ^1.2.8 to ^1.2.9 (#139)

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@1.2.8...1.2.9)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

composer.json

@@ -26,7 +26,7 @@
         "phpstan/phpstan-phpunit": "^1.4.0",
         "phpstan/phpstan-strict-rules": "^1.6.1",
         "phpunit/phpunit": "^11.4.3",
-        "rector/rector": "^1.2.8",
+        "rector/rector": "^1.2.9",
         "spaze/phpstan-disallowed-calls": "^3.5",
         "squizlabs/php_codesniffer": "^3.10.3"
     },