Bump Microsoft.Extensions.Configuration.Json from 3.1.1 to 3.1.8 (#161)

Bumps [Microsoft.Extensions.Configuration.Json](https://github.com/aspnet/Extensions) from 3.1.1 to 3.1.8.
- [Release notes](https://github.com/aspnet/Extensions/releases)
- [Commits](dotnet/extensions@v3.1.1...v3.1.8)

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src/Microsoft.Azure.NotificationHubs.DotNetCore.Tests/Microsoft.Azure.NotificationHubs.DotNetCore.Tests.csproj

@@ -9,7 +9,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Azure.Storage.Blob" Version="11.2.2" />
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="3.1.8" />
-    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="3.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="3.1.8" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
     <PackageReference Include="RichardSzalay.MockHttp" Version="6.0.0" />
     <PackageReference Include="xunit" Version="2.4.1" />

src/Microsoft.Azure.NotificationHubs.DotNetFramework.Tests/Microsoft.Azure.NotificationHubs.DotNetFramework.Tests.csproj

@@ -24,7 +24,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Azure.Storage.Blob" Version="11.2.2" />
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="3.1.8" />
-    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="3.1.8" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
     <PackageReference Include="xunit" Version="2.3.1" />
     <PackageReference Include="xunit.runner.console" Version="2.4.1" />