Update VersionTest.cs

Author: SimonCropp

src/DiffEngine.Tests/VersionTest.cs

@@ -3,8 +3,10 @@
     [Fact]
     public void Run()
     {
+        #if NET6_0_OR_GREATER
         // because v9 throw "windows not supported" for .net 6
         var version = typeof(System.Management.ManagementObject).Assembly.GetName().Version!;
         Assert.Equal("8.0.0.0", version.ToString());
+        #endif
     }
 }