Upgrade to pre-release of xUnit v3

Author: 0xced

tests/Serilog.Formatting.Log4Net.Tests.csproj

@@ -15,9 +15,9 @@
     <PackageReference Include="Serilog" Version="4.1.0" />
     <PackageReference Include="Serilog.Enrichers.Environment" Version="3.0.1" />
     <PackageReference Include="Serilog.Enrichers.Thread" Version="4.0.0" />
-    <PackageReference Include="Verify.Xunit" Version="28.3.2" />
-    <PackageReference Include="xunit" Version="2.9.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" PrivateAssets="all" />
+    <PackageReference Include="Verify.XunitV3" Version="28.3.2" />
+    <PackageReference Include="xunit.v3" Version="0.6.0-pre.7" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.0.0-pre.49" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup>