Update xUnit.net

Author: 0xced

tests/Serilog.Formatting.Log4Net.Tests.csproj

@@ -17,8 +17,8 @@
     <PackageReference Include="Serilog.Enrichers.Environment" Version="3.0.1" />
     <PackageReference Include="Serilog.Enrichers.Thread" Version="4.0.0" />
     <PackageReference Include="Verify.Xunit" Version="25.3.0" />
-    <PackageReference Include="xunit" Version="2.8.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.1" PrivateAssets="all" />
+    <PackageReference Include="xunit" Version="2.9.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup>