Update rector/rector requirement from ^0.18.2 to ^1.2.6

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@0.18.2...1.2.6)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

composer.json

@@ -69,7 +69,7 @@
         "phpstan/phpstan-phpunit": "^1.1",
         "phpstan/phpstan-webmozart-assert": "^1.2",
         "phpunit/phpunit": "^9.5",
-        "rector/rector": "^0.18.2",
+        "rector/rector": "^1.2.6",
         "sylius-labs/coding-standard": "^4.0",
         "sylius/grid-bundle": "^1.11",
         "symfony/console": "^5.4 || ^6.4 || ^7.0",