Update pve8-upgrade.sh

fix version check

misc/pve8-upgrade.sh

@@ -124,10 +124,10 @@ if ! command -v pveversion >/dev/null 2>&1; then
   exit
 fi
 
-if ! pveversion | grep -Eq "pve-manager/(7\.4-(13|14|15|16|17))"; then
+if ! pveversion | grep -Eq "pve-manager/(7\.4-(16|17|18|19))"; then
   header_info
   msg_error "This version of Proxmox Virtual Environment is not supported"
-  echo -e "  PVE Version 7.4-13 or higher is required."
+  echo -e "  PVE Version 7.4-16 or higher is required."
   echo -e "\nExiting..."
   sleep 3
   exit