fix: Fix missing var-dumper dependency (#1053)

Currently it is included via HumbugBox as a transitive dev deps but it
is a required dependency for some commands like `inspect`.

Author: theofidry

composer.json

@@ -25,6 +25,7 @@
         "symfony/console": "^6.4 || ^7.0",
         "symfony/filesystem": "^6.4 || ^7.0",
         "symfony/finder": "^6.4 || ^7.0",
+        "symfony/var-dumper": "^7.1",
         "thecodingmachine/safe": "^2.0"
     },
     "require-dev": {