Update ms.date to 03/19/2026 for agent-pre-purchase.md

Author: pri-mittal

articles/cost-management-billing/reservations/agent-pre-purchase.md

@@ -6,7 +6,7 @@ ms.reviewer: primittal
 ms.service: cost-management-billing
 ms.subservice: reservations
 ms.topic: conceptual
-ms.date: 02/10/2026
+ms.date: 03/19/2026
 ms.author: primittal
 ---