[TransformersPhp] Add allow-plugins config for Composer plugins

Allow codewithkyrian/platform-package-installer and
codewithkyrian/transformers-libsloader plugins.

Author: OskarStark

src/platform/src/Bridge/TransformersPhp/composer.json

@@ -38,6 +38,10 @@
         }
     },
     "config": {
+        "allow-plugins": {
+            "codewithkyrian/platform-package-installer": true,
+            "codewithkyrian/transformers-libsloader": true
+        },
         "sort-packages": true
     },
     "extra": {