Add OrderedDictionary to sandbox whitelist

Fixes #6411

RELEASE-NOTES.md

@@ -40,6 +40,7 @@ END TEMPLATE-->
 ### New features
 
 * If a sandbox error is caused by a compiler-generated method, the engine will now attempt to point out which using code is responsible.
+* Added `OrderedDictionary<TKey, TValue>` to the sandbox whitelist.
 
 ### Bugfixes
 

Robust.Shared/ContentPack/Sandbox.yml

@@ -444,6 +444,7 @@ Types:
     LinkedList`1: { All: True }
     LinkedListNode`1: { All: True }
     List`1: { All: True }
+    OrderedDictionary`2: { All: True }
     Queue`1: { All: True }
     ReferenceEqualityComparer: { All: True }
     SortedDictionary`2: { All: True }