[PHP]: Update serendipity_hq/phpcs-config requirement

Updates the requirements on [serendipity_hq/phpcs-config](https://github.com/SerendipityHQ/phpcs-config) to permit the latest version.
- [Commits](SerendipityHQ/phpcs-config@1.2.4...1.2.5)

---
updated-dependencies:
- dependency-name: serendipity_hq/phpcs-config
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor-bin/phpcs/composer.json

@@ -1,6 +1,6 @@
 {
     "require-dev": {
         "friendsofphp/php-cs-fixer": "3.34.1",
-        "serendipity_hq/phpcs-config": "1.2.4"
+        "serendipity_hq/phpcs-config": "1.2.5"
     }
 }