Updated MoonCore dependencies. Switched to asp.net core native authentication scheme abstractions. Updated claim usage in frontend

Moonlight.Client/UI/Components/WelcomeOverviewElement.razor

@@ -1,4 +1,5 @@
-@using Microsoft.AspNetCore.Components.Authorization
+@using System.Security.Claims
+@using Microsoft.AspNetCore.Components.Authorization
 
 <div class="col-span-12 md:col-span-6">
     <div class="font-medium leading-[1.1] tracking-tight">
@@ -18,7 +19,6 @@
     protected override async Task OnInitializedAsync()
     {
         var identity = await AuthState;
-        var usernameClaim = identity.User.Claims.ToArray().First(x => x.Type == "username");
-        Username = usernameClaim.Value;
+        Username = identity.User.FindFirst(ClaimTypes.Name)!.Value;
     }
 }