sing-box: update to 1.12.9

Co-authored-by: yidaduizuoye (@CAB233)

Author: aosc-buildit-bot

app-proxy/sing-box/spec

@@ -1,4 +1,4 @@
-VER=1.12.8
+VER=1.12.9
 SRCS="git::commit=tags/v$VER;submodule=false::https://github.com/SagerNet/sing-box"
 CHKSUMS="SKIP"
 CHKUPDATE="anitya::id=372359"