Bump xunit to 2.9.2

Author: CZEMacLeod

test/Directory.Build.Targets

@@ -3,7 +3,7 @@
 
   <ItemGroup Label="Testing" Condition="'$(IsTestProject)'=='true'">
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
-    <PackageReference Include="xunit" Version="2.9.1" />
+    <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>