Add Gateway API v1.3 Blog Post

Add Gateway API v1.3 Blog Post for 06-02-2025

Co-authored-by: Arpit Agrawal, Tim Bannister, Eric Bishop,
Rob Scott, Dipesh Rawat, and Nick Young

Author: candita

content/en/blog/_posts/2025-05-28-gateway-api-v1.3/gateway-api-logo.svg renamed to content/en/blog/_posts/2025-06-02-gateway-api-v1.3/gateway-api-logo.svg

@@ -1,8 +1,7 @@
 ---
 layout: blog
 title: "Gateway API v1.3.0: Advancements in Request Mirroring, CORS, Gateway Merging, and Retry Budgets"
-date: 2025-05-28T09:00:00-08:00
-draft: true
+date: 2025-06-02T09:00:00-08:00
 slug: gateway-api-v1-3
 author: >
   [Candace Holman](https://github.com/candita) (Red Hat)