Merge pull request #57 from sleeuwen/dependabot/nuget/xunit-2.9.0

Bump xunit from 2.8.1 to 2.9.0

Author: sleeuwen

dotnet-json.Tests/dotnet-json.Tests.csproj

@@ -13,7 +13,7 @@
   <ItemGroup>
     <PackageReference Include="FluentAssertions" Version="6.12.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
-    <PackageReference Include="xunit" Version="2.8.1" />
+    <PackageReference Include="xunit" Version="2.9.0" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.1" PrivateAssets="All" />
     <PackageReference Include="coverlet.collector" Version="6.0.2" PrivateAssets="All" />
   </ItemGroup>