Consolidated Serilog nuget version in AppConfigDemo with other projects.

Author: ckadluba

sample/AppConfigDemo/packages.config

@@ -9,12 +9,12 @@
   <package id="Microsoft.IdentityModel.Protocols.OpenIdConnect" version="6.21.0" targetFramework="net462" />
   <package id="Microsoft.IdentityModel.Tokens" version="6.21.0" targetFramework="net462" />
   <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net462" />
-  <package id="Serilog" version="2.9.0" targetFramework="net462" />
-  <package id="Serilog.Settings.AppSettings" version="2.2.2" targetFramework="net462" />
+  <package id="Serilog" version="2.5.0" targetFramework="net462" />
+  <package id="Serilog.Settings.AppSettings" version="2.1.2" targetFramework="net462" />
   <package id="System.Buffers" version="4.5.1" targetFramework="net462" />
   <package id="System.Data.Common" version="4.3.0" targetFramework="net462" />
   <package id="System.IdentityModel.Tokens.Jwt" version="6.21.0" targetFramework="net462" />
   <package id="System.Memory" version="4.5.4" targetFramework="net462" />
   <package id="System.Numerics.Vectors" version="4.5.0" targetFramework="net462" />
   <package id="System.Runtime.CompilerServices.Unsafe" version="4.7.1" targetFramework="net462" />
-</packages>
+</packages>