Bump the requirements of metamodels/core, attribute file and the dcg

Author: baumannsven

composer.json

@@ -33,10 +33,10 @@
   },
   "require": {
     "php": "^7.1",
-    "contao-community-alliance/dc-general": "^2.1.0",
+    "contao-community-alliance/dc-general": "^2.1.3",
     "contao/core-bundle": "^4.4.8",
-    "metamodels/attribute_file": "dev-hotfix/2.1.1 as 2.1.1",
-    "metamodels/core": "^2.1@dev",
+    "metamodels/core": "^2.1.1",
+    "metamodels/attribute_file": "^2.1.1",
     "symfony/dependency-injection": "^3.3 || ^4.0",
     "symfony/http-kernel": "^3.3 || ^4.0"
   },