fix(server): fix datetime type for file

src/models/file/file.graphql

@@ -6,8 +6,8 @@ type File {
   url(size: small): String!
   # storedObjects: [StoredObjects!]!
   uploadStatus: String
-  updated: Date!
-  created: Date!
+  updated: DateTime!
+  created: DateTime!
 }
 
 type ImageMetadata {