composer: don't add repository for mcp now it's public

Author: ashleyhindle

composer.json

@@ -12,12 +12,6 @@
         "issues": "https://github.com/laravel/boost/issues",
         "source": "https://github.com/laravel/boost"
     },
-    "repositories": [
-        {
-            "type": "git",
-            "url": "[email protected]:laravel/mcp.git"
-        }
-    ],
     "require": {
         "php": "^8.1|^8.2",
         "guzzlehttp/guzzle": "^7.9",