Update Hangfire Dashboard Authorization syntax

Updated the `Authorization` property in `app.UseHangfireDashboard`
to use modern C# collection initialization syntax (square brackets)
instead of the older array initialization syntax (curly braces).
This change ensures consistency with modern C# conventions.

ECMJobRunner.WebCron/Program.cs

@@ -140,7 +140,7 @@ app.UseAuthorization();
 // Add Hangfire Dashboard with no authentication (for development)
 app.UseHangfireDashboard("/hangfire", new DashboardOptions
 {
-    Authorization = new[] { new AllowAllDashboardAuthorizationFilter() }
+    Authorization = [new AllowAllDashboardAuthorizationFilter()]
 });
 
 // Add Health Check UI route (accessible outside Hangfire dashboard)