Update test packages.

Author: bgrainger

Directory.Packages.props

@@ -15,15 +15,15 @@
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.0" />
     <PackageVersion Include="Microsoft.Extensions.Logging.Abstractions" Version="7.0.1" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageVersion Include="MySql.Data" Version="8.3.0" />
     <PackageVersion Include="NLog" Version="4.5.0" />
     <PackageVersion Include="Serilog" Version="2.6.0" />
     <PackageVersion Include="StyleCop.Analyzers" Version="1.2.0-beta.556" />
     <PackageVersion Include="System.Diagnostics.DiagnosticSource" Version="7.0.2" />
     <PackageVersion Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
-    <PackageVersion Include="xunit" Version="2.6.6" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.6" />
+    <PackageVersion Include="xunit" Version="2.7.0" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.7" />
     <PackageVersion Include="YamlDotNet" Version="13.7.1" />
   </ItemGroup>