Bump Xunit.v3 dependencies to v3

Author: AArnott

Directory.Packages.props

@@ -19,8 +19,8 @@
     <PackageVersion Include="System.ComponentModel.Composition" Version="9.0.0" />
     <PackageVersion Include="Xunit.SkippableFact" Version="1.5.23" />
     <PackageVersion Include="xunit" Version="2.9.3" />
-    <PackageVersion Include="xunit.v3.assert" Version="2.0.3" />
-    <PackageVersion Include="xunit.v3.extensibility.core" Version="2.0.3" />
+    <PackageVersion Include="xunit.v3.assert" Version="3.0.0" />
+    <PackageVersion Include="xunit.v3.extensibility.core" Version="3.0.0" />
   </ItemGroup>
   <ItemGroup Label="Library.Template">
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />