Removed obsolete line in AppConfigDemp packages.config

Author: ckadluba

sample/AppConfigDemo/packages.config

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <!--<package id="Microsoft.Extensions.Configuration.Abstractions" version="3.1.4" targetFramework="net462" />-->
   <package id="Microsoft.Extensions.Primitives" version="3.1.4" targetFramework="net462" />
   <package id="Microsoft.Identity.Client" version="4.45.0" targetFramework="net462" />
   <package id="Microsoft.IdentityModel.Abstractions" version="6.21.0" targetFramework="net462" />