Update Microsoft.Extensions.Configuration.Json NuGet package

Author: peetw

Tests.NHibernate.Spatial/Tests.NHibernate.Spatial.csproj

@@ -50,7 +50,7 @@
 
   <ItemGroup>
     <PackageReference Include="log4net" Version="2.0.11" />
-    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="3.1.9" />
     <PackageReference Include="NUnit" Version="3.12.0" />
   </ItemGroup>