Make error tests sequential

There are threading issues with Marshal.GetExceptionForHR.

src/thirtytwo_tests/Support/ErrorTestCollection.cs

@@ -0,0 +1,14 @@
+// Copyright (c) Jeremy W. Kuhne. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.Runtime.InteropServices;
+
+namespace Windows.Support;
+
+/// <summary>
+///  There are threading issues with <see cref="Marshal.GetExceptionForHR(int)"/>
+/// </summary>
+[CollectionDefinition(nameof(ErrorTestCollection), DisableParallelization = true)]
+public class ErrorTestCollection
+{
+}

src/thirtytwo_tests/Support/ErrorTests.cs

@@ -5,6 +5,7 @@
 
 namespace Windows.Support;
 
+[Collection(nameof(ErrorTestCollection))]
 public class ErrorTests
 {
     [Fact]