Use Result instead of GetAwaiter().GetResult() (#13614)

Author: Kahbazi

src/Middleware/CORS/src/Infrastructure/CorsMiddleware.cs

@@ -181,7 +181,7 @@ public Task Invoke(HttpContext context, ICorsPolicyProvider corsPolicyProvider)
                     return InvokeCoreAwaited(context, policyTask);
                 }
 
-                corsPolicy = policyTask.GetAwaiter().GetResult();
+                corsPolicy = policyTask.Result;
             }
 
             return EvaluateAndApplyPolicy(context, corsPolicy);