docs: Update visibility for 1.21.5 update documentation

Author: OliverSchlueter

docs/src/blog/1_21_5-update.md

@@ -8,7 +8,6 @@ authors:
 date: 2025-04-19
 title: 1.21.5 Update (Spring to Life)
 description: Everything you need to know about the 1.21.5 update.
-visibility: hidden
 ---
 
 ![](../static/1_21_5-update.png)