Update adguard.sh

ct/adguard.sh

@@ -220,7 +220,7 @@ pushd $TEMP_DIR >/dev/null
 
 export CTID=$(pvesh get /cluster/nextid)
 export PCT_OSTYPE=debian
-export PCT_OSVERSION=11
+export PCT_OSVERSION=11.3
 export PCT_DISK_SIZE=2
 export PCT_OPTIONS="
   -features $FEATURES