Fix build warnings

src/Velopack.Vpk/Compat/EmbeddedRunner.cs

@@ -1,4 +1,4 @@
-using System.Runtime.Versioning;
+using System.Runtime.Versioning;
 using Velopack.Deployment;
 using Velopack.Packaging.Commands;
 using Velopack.Packaging.Unix.Commands;
@@ -66,6 +66,7 @@ public class EmbeddedRunner : ICommandRunner
         return new OsxPackCommandRunner(_logger).Run(options);
     }
 
+    [SupportedOSPlatform("windows")]
     public virtual Task ExecutePackWindows(WindowsPackCommand command)
     {
         var options = new WindowsPackOptions {

test/Velopack.Tests/ShortcutTests.cs

@@ -1,4 +1,5 @@
-using System;
+#pragma warning disable CS0618 // Type or member is obsolete
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.Versioning;