update image

Author: estruyf

featured.json

@@ -5,7 +5,7 @@
       "name": "GitHub Blog",
       "link": "https://github.blog"
     },
-    "preview": "/featured/github-release-202203.jpg",
+    "preview": "/featured/Hacktoberfest-banner.webp",
     "type": "article",
     "featured": true
   }, {