Randomize gravity update time between 03:01 - 04:58 (excluding 04:00)

Signed-off-by: DL6ER <dl6er@dl6er.de>

automated install/basic-install.sh

@@ -1357,7 +1357,7 @@ installCron() {
   # Copy the cron file over from the local repo
   cp ${PI_HOLE_LOCAL_REPO}/advanced/pihole.cron /etc/cron.d/pihole
   # Randomize gravity update time
-  sed -i "s/59 1/$((RANDOM % 60)) $((2 + RANDOM % 2))/" /etc/cron.d/pihole
+  sed -i "s/59 1/$((1 + RANDOM % 58)) $((3 + RANDOM % 2))/" /etc/cron.d/pihole
   echo -e "${OVER}  ${TICK} ${str}"
 }