Remove --strict to composer validate (using @dev for now on deps)

Author: fabpot

demo/composer.json

@@ -105,7 +105,7 @@
             "importmap:install": "symfony-cmd"
         },
         "pipeline": [
-            "composer validate --strict",
+            "composer validate",
             "php -l src/**/*.php tests/**/*.php",
             "bin/console lint:twig templates",
             "bin/console lint:yaml config",