slapos_web_deploy: remove support for Debian 9 and Ubuntu 16

master/bt5/slapos_web_deploy/PathTemplateItem/web_page_module/deploy_base_setup.txt

@@ -39,7 +39,7 @@ fi
 
 # Warn users who aren't on an explicitly supported distro, but allow them to
 # override check and attempt installation with ``export FORCE=yes``
-if [[ ! ${DISTRO} =~ (stretch|buster|bullseye|bookworm|xenial|bionic|focal|jammy|noble|Kylin-v10.|rhel7|Linuxmint-21.1) ]]; then
+if [[ ! ${DISTRO} =~ (buster|bullseye|bookworm|bionic|focal|jammy|noble|Kylin-v10.|rhel7|Linuxmint-21.1) ]]; then
     echo "WARNING: this script has not been tested on $DISTRO"
     if [[ "$FORCE" != "yes" ]]; then
         die $LINENO "If you wish to run this script anyway run with FORCE=yes"