Update dependency symfony/var-dumper to v8

| datasource | package            | from   | to    |
| ---------- | ------------------ | ------ | ----- |
| packagist  | symfony/var-dumper | 6.4.21 | 8.0.0 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

composer.json

@@ -39,7 +39,7 @@
         "laminas/laminas-servicemanager": "^3.8",
         "laminas/laminas-stdlib": "^3.8",
         "laminas/laminas-view": "^2.14",
-        "symfony/var-dumper": "^6.0 || ^7.0"
+        "symfony/var-dumper": "^6.0 || ^7.0 || ^8.0"
     },
     "require-dev": {
         "laminas/laminas-coding-standard": "~3.1.0",