update 5.11 with old:true

Author: cumulusAnia

content/cumulus-linux-511/_index.md

@@ -6,6 +6,7 @@ subsection: true
 cascade:
     product: Cumulus Linux
     version: "5.11"
+    old: true
 toc: 1
 ---
 NVIDIA® Cumulus Linux is the first full-featured {{<exlink url="https://www.debian.org/releases/bookworm/" text="Debian bookworm" >}}-based, Linux operating system for the networking industry.