Update prompt-flow.md

Author: lgayhardt

articles/ai-foundry/concepts/prompt-flow.md

@@ -9,7 +9,7 @@ ms.custom:
   - build-2024
   - ignite-2024
 ms.topic: concept-article
-ms.date: 03/18/2025
+ms.date: 06/30/2025
 ms.reviewer: none
 ms.author: lagayhar
 author: lgayhardt