Use C# 12 collection expression syntax for cleaner initialization

Co-authored-by: niemyjski <[email protected]>

Author: Copilot

src/Exceptionless.Web/Controllers/OrganizationController.cs

@@ -476,8 +476,8 @@ public async Task<ActionResult<ChangePlanResult>> ChangePlanAsync(string id, str
             }
             else
             {
-                var update = new SubscriptionUpdateOptions { Items = new List<SubscriptionItemOptions>() };
-                var create = new SubscriptionCreateOptions { Customer = organization.StripeCustomerId, Items = new List<SubscriptionItemOptions>() };
+                var update = new SubscriptionUpdateOptions { Items = [] };
+                var create = new SubscriptionCreateOptions { Customer = organization.StripeCustomerId, Items = [] };
                 bool cardUpdated = false;
 
                 var customerUpdateOptions = new CustomerUpdateOptions { Description = organization.Name };