Updated .NET SDK used by ALC project to 8.0 (#28446)

Author: isra-fel

src/Accounts/Accounts/ChangeLog.md

@@ -19,6 +19,7 @@
 -->
 
 ## Upcoming Release
+* Updated `AuthenticationAssemblyLoadContext` project to deprecate .NET 6.0 and build on .NET 8.0.
 * Added Server-Side Pagination Support for `Invoke-AzRestMethod` command via `-Paginate` parameter.
 
 ## Version 5.2.0

src/Accounts/AuthenticationAssemblyLoadContext/AuthenticationAssemblyLoadContext.csproj

@@ -6,7 +6,7 @@
   <Import Project="$(MSBuildThisFileDirectory)..\..\Az.props" />
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <AssemblyName>Microsoft.Azure.PowerShell.AuthenticationAssemblyLoadContext</AssemblyName>
     <RootNamespace>Microsoft.Azure.PowerShell.AuthenticationAssemblyLoadContext</RootNamespace>
   </PropertyGroup>