Minor node fixes

- Update Dot Product to use Dynamic Vectors
- Change Branch evaluation to lerp

com.unity.shadergraph/Editor/Data/Nodes/Math/Vector/DotProductNode.cs

         }
 
         static string Unity_DotProduct(
-            [Slot(0, Binding.None, 0, 0, 0, 0)] Vector3 A,
-            [Slot(1, Binding.None, 0, 1, 0, 0)] Vector3 B,
+            [Slot(0, Binding.None, 0, 0, 0, 0)] DynamicDimensionVector A,
+            [Slot(1, Binding.None, 0, 1, 0, 0)] DynamicDimensionVector B,
             [Slot(2, Binding.None)] out Vector1 Out)
         {
             return

com.unity.shadergraph/Editor/Data/Nodes/Utility/Logic/BranchNode.cs

             return
                 @"
 {
-    Out = (Predicate * True) + abs((Predicate - 1) * False);
+    Out = lerp(False, True, Predicate);
 }
 ";
         }