Update dependency symfony/event-dispatcher to v8

| datasource | package                  | from  | to    |
| ---------- | ------------------------ | ----- | ----- |
| packagist  | symfony/event-dispatcher | 7.4.0 | 8.0.0 |


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

Author: renovate[bot]

composer.json

@@ -31,7 +31,7 @@
         "composer-runtime-api": "^2.0.0",
         "psr/container": "^1.0 || ^2.0",
         "symfony/console": "^6.0 || ^7.0",
-        "symfony/event-dispatcher": "^6.0 || ^7.0",
+        "symfony/event-dispatcher": "^6.0 || ^7.0 || ^8.0",
         "webmozart/assert": "^1.11"
     },
     "require-dev": {