ci: fix packer cleanup script

Author: NGPixel

dev/packer/scripts/900-cleanup.sh

@@ -16,8 +16,7 @@ chmod 1777 /tmp
 
 export DEBIAN_FRONTEND=noninteractive
 apt-get -y update
-apt-get -o Dpkg::Options::="--force-confold" upgrade -q -y --force-yes
-apt-get purge droplet-agent
+apt-get -y purge droplet-agent
 rm -rf /opt/digitalocean
 apt-get -y autoremove
 apt-get -y autoclean