[Examples] Add minimum-stability dev to composer.json

Adds minimum-stability configuration to allow dev dependencies
and development versions of packages in examples.

Author: devmatt000

examples/composer.json

@@ -3,6 +3,7 @@
     "description": "Example scripts about using Symfony AI",
     "license": "MIT",
     "type": "project",
+    "minimum-stability": "dev",
     "require": {
         "php": ">=8.2",
         "ext-pdo": "*",