Update dependency symfony/yaml to v8

| datasource | package      | from  | to    |
| ---------- | ------------ | ----- | ----- |
| packagist  | symfony/yaml | 7.3.5 | 8.0.8 |


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

Author: renovate[bot]

composer.json

@@ -58,7 +58,7 @@
         "phly/phly-event-dispatcher": "^1.5.0",
         "spatie/yaml-front-matter": "^2.1.0",
         "symfony/console": "^7.3.3",
-        "symfony/yaml": "^7.3.3"
+        "symfony/yaml": "^8.0.0"
     },
     "require-dev": {
         "filp/whoops": "^2.14.5",