Bump stable to 29.0.4 (fix #2258)

Signed-off-by: J0WI <[email protected]>

Author: J0WI

generate-stackbrew-library.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -Eeuo pipefail
 
-stable_channel='28.0.7'
+stable_channel='29.0.4'
 
 self="$(basename "$BASH_SOURCE")"
 cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"