build(deps-dev): update rector/rector requirement from 0.15.13 to 1.2.1

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@0.15.13...1.2.1)

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

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

composer.json

@@ -84,7 +84,7 @@
 		"phpstan/phpstan": "1.11.5",
 		"phpunit/phpunit": "10.5.24",
 		"phpunit/php-code-coverage": "10.1.14",
-		"rector/rector": "0.15.13",
+		"rector/rector": "1.2.1",
 		"squizlabs/php_codesniffer": "3.10.1"
 	}
 }