api: pin symfony/routing

It seems the transitive dependency is not locked good enough.
So we have to do it.

Author: BacLuc

api/composer.json

@@ -52,6 +52,7 @@
         "symfony/monolog-bundle": "3.11.1",
         "symfony/property-access": "7.4.0",
         "symfony/property-info": "7.4.0",
+        "symfony/routing": "7.4.0",
         "symfony/runtime": "7.4.0",
         "symfony/security-bundle": "7.4.0",
         "symfony/serializer": "7.4.0",