chore: removes extra dep

Signed-off-by: Vincent Biret <vibiret@microsoft.com>

Author: baywet

test/Microsoft.OpenApi.Readers.Tests/Microsoft.OpenApi.Readers.Tests.csproj

@@ -22,8 +22,6 @@
         <PackageReference Include="SharpYaml" Version="2.1.1" />
         <PackageReference Include="xunit" Version="2.9.3" />
         <PackageReference Include="xunit.runner.visualstudio" Version="3.0.2" PrivateAssets="all" />
-        <!--STJ required until Microsoft.Extensions.Logging.Console and Microsoft.Extensions.Configuration.Json update their dependencies -->
-        <PackageReference Include="System.Text.Json" Version="9.0.2" />
     </ItemGroup>
 
     <ItemGroup>