Fix Mandrel incorret use of , to separate tags

It lead to breaking the release tag generation

Author: emmanuelbernard

_posts/2025-10-02-mandrel-25-released.adoc

@@ -2,7 +2,7 @@
 layout: post
 title: 'Mandrel 25 is Here!'
 date: 2025-10-02
-tags: release, mandrel, native, graalvm
+tags: release mandrel native graalvm
 synopsis: 'Mandrel 25, based on GraalVM 25, has been released.'
 author: sgehwolf
 ---