Ensure we don't downgrade VS version

TestAssets/NonRestoredTestProjects/PJAppWithSlnVersionUnknown/Program.cs

@@ -0,0 +1,16 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+
+namespace TestApp
+{
+    public class Program
+    {
+        public static int Main(string[] args)
+        {
+            Console.WriteLine("Hello world");
+            return 0;
+        }
+    }
+}