And sadly we can't use new() either

Signed-off-by: Lamont Granquist <lamont@scriptkiddie.org>

MechJeb2/VesselExtensions.cs

@@ -82,7 +82,7 @@ public static List<ITargetable> GetTargetables(this Vessel vessel)
         }
 
         private static          float                         lastFixedTime;
-        private static readonly Dictionary<Guid, MechJebCore> masterMechJeb = new();
+        private static readonly Dictionary<Guid, MechJebCore> masterMechJeb = new Dictionary<Guid, MechJebCore>();
 
         public static MechJebCore GetMasterMechJeb(this Vessel vessel)
         {