Update test packages.

Author: bgrainger

Directory.Packages.props

@@ -6,7 +6,7 @@
 
   <ItemGroup>
     <PackageVersion Include="AdoNet.Specification.Tests" Version="2.0.0-beta.2" />
-    <PackageVersion Include="Dapper.StrongName" Version="2.1.24" />
+    <PackageVersion Include="Dapper.StrongName" Version="2.1.28" />
     <PackageVersion Include="IndexRange" Version="1.0.2" />
     <PackageVersion Include="log4net" Version="2.0.10" />
     <PackageVersion Include="Microsoft.Extensions.Configuration.Binder" Version="8.0.1" />
@@ -22,7 +22,7 @@
     <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="2.6.5" />
+    <PackageVersion Include="xunit" Version="2.6.6" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.6" />
     <PackageVersion Include="YamlDotNet" Version="13.7.1" />
   </ItemGroup>