Retrigger CI after fork sync

Author: jesuszarate

src/Microsoft.DotNet.Build.Tasks.Workloads/src/CatalogFileGenerator.cs

@@ -1,6 +1,8 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+#nullable enable
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;