Update NixOS version in AMI terraform configuration (#1908)

Co-authored-by: Thilo Billerbeck <[email protected]>

Author: arianvp

core/src/content/download/52-nixos-amazon.mdx

@@ -29,7 +29,7 @@ data "aws_ami" "nixos_arm64" {
 
   filter {
     name   = "name"
-    values = ["nixos/24.11*"]
+    values = ["nixos/25.11*"]
   }
   filter {
     name   = "architecture"