Ensure alpha branch dependencies in composer.json

composer.json

@@ -83,10 +83,10 @@
         "scheb/2fa-bundle": "^6.12.0",
         "scheb/2fa-email": "^6.12.0",
         "scheb/2fa-google-authenticator": "^6.12.0",
-        "shopsys/form-types-bundle": "16.0.x-dev",
+        "shopsys/form-types-bundle": "dev-alpha as 16.0.x-dev",
         "shopsys/jsformvalidator-bundle": "^1.7.0",
-        "shopsys/migrations": "16.0.x-dev",
-        "shopsys/plugin-interface": "16.0.x-dev",
+        "shopsys/migrations": "dev-alpha as 16.0.x-dev",
+        "shopsys/plugin-interface": "dev-alpha as 16.0.x-dev",
         "snc/redis-bundle": "^4.4.1",
         "spatie/opening-hours": "^3.0",
         "stof/doctrine-extensions-bundle": "^1.3.0",
@@ -119,7 +119,7 @@
         "phpstan/phpstan-symfony": "^1.4.6",
         "phpunit/phpunit": "^11.2.1",
         "psr/event-dispatcher": "^1.0.0",
-        "shopsys/coding-standards": "16.0.x-dev",
+        "shopsys/coding-standards": "dev-alpha as 16.0.x-dev",
         "sspooky13/yaml-standards": "^9.0",
         "symfony/var-dumper": "^5.4"
     },