chore(deps): update dependency typo3/cms-backend to v14 [security]

| datasource | package           | from    | to     |
| ---------- | ----------------- | ------- | ------ |
| packagist  | typo3/cms-backend | 12.4.36 | 14.0.0 |

Author: renovate[bot]

composer.json

@@ -16,7 +16,7 @@
 		"php": "^8.1",
 		"psr/http-message": "^1.0 || ^2.0",
 		"simshaun/recurr": "^5.0 || ^6.0",
-		"typo3/cms-backend": "^12.0 || ^13.0",
+		"typo3/cms-backend": "^14.0",
 		"typo3/cms-core": "^12.0 || ^13.0",
 		"typo3/cms-dashboard": "^12.0 || ^13.0",
 		"typo3/cms-extbase": "^12.0 || ^13.0",