net 6 upgrade

CRM.Visitors/CRM.Visitors.Publish.csproj

 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>net6.0</TargetFramework>
     <AssemblyName>Bizgaze.CRM.Visitors</AssemblyName>
     <RootNamespace>Bizgaze.CRM.Visitors</RootNamespace>
   </PropertyGroup>