Update dependency sebastian/diff to v8

| datasource | package        | from  | to    |
| ---------- | -------------- | ----- | ----- |
| packagist  | sebastian/diff | 6.0.2 | 8.0.0 |

Author: renovate[bot]

composer.json

@@ -43,7 +43,7 @@
         "psr/http-client-implementation": "*",
         "psr/http-factory": "^1.0",
         "psr/http-message": "^1.0 || ^2.0",
-        "sebastian/diff": "^5.0 || ^6.0 || ^7.0",
+        "sebastian/diff": "^5.0 || ^6.0 || ^7.0 || ^8.0",
         "symfony/console": "^6.4.13 || ^7.0.0",
         "webmozart/assert": "^1.11"
     },