Remove dangling upgrade external plugins script

scripts/upgrade_plugins.sh

@@ -1,68 +0,0 @@
-#!/bin/zsh
-# Copyright (c) HashiCorp, Inc.
-# SPDX-License-Identifier: BUSL-1.1
-
-
-## This script is to be run before a Packer release in order to update
-## all vendored plugins to the latest available release.
-## The SDK is included in the plugin list and will be upgraded as well if a
-## newest version is available.
-## This script should be run in packer's root.
-
-declare -a plugins=(
-	"hashicorp/packer-plugin-alicloud"
-	"hashicorp/packer-plugin-amazon"
-	"hashicorp/packer-plugin-ansible"
-	"hashicorp/packer-plugin-azure"
-	"hashicorp/packer-plugin-chef"
-	"hashicorp/packer-plugin-cloudstack"
-	"hashicorp/packer-plugin-converge"
-	"digitalocean/packer-plugin-digitalocean"
-	"hashicorp/packer-plugin-docker"
-	"hashicorp/packer-plugin-googlecompute"
-	"hashicorp/packer-plugin-hcloud"
-	"hashicorp/packer-plugin-hyperone"
-	"hashicorp/packer-plugin-hyperv"
-	"hashicorp/packer-plugin-jdcloud"
-	"hashicorp/packer-plugin-linode"
-	"hashicorp/packer-plugin-lxc"
-	"hashicorp/packer-plugin-lxd"
-	"hashicorp/packer-plugin-ncloud"
-	"hashicorp/packer-plugin-openstack"
-	"hashicorp/packer-plugin-oneandone"
-	"hashicorp/packer-plugin-parallels"
-	"hashicorp/packer-plugin-profitbricks"
-	"hashicorp/packer-plugin-proxmox"
-	"hashicorp/packer-plugin-puppet"
-	"hashicorp/packer-plugin-qemu"
-	"hashicorp/packer-plugin-sdk"
-	"hashicorp/packer-plugin-tencentcloud"
-	"hashicorp/packer-plugin-triton"
-	"hashicorp/packer-plugin-ucloud"
-	"hashicorp/packer-plugin-vagrant"
-	"hashicorp/packer-plugin-virtualbox"
-	"hashicorp/packer-plugin-vmware"
-	"hashicorp/packer-plugin-vsphere"
-	"hashicorp/packer-plugin-yandex"
-)
-
-## now loop through the above plugin array
-## update the plugins and the SDK to the latest available version
-for i in "${plugins[@]}"
-do
-   happy=false
-   while ! $happy
-    do
-      echo "upgrading $i"
-      output=$(go get -d github.com/$i)
-      happy=true
-      if [[ $output == *"443: Connection refused"*  ]]; then
-        echo "Try again after 5 seconds"
-        sleep 5
-        happy=false
-      fi
-    done
-   sleep 1
-done
-
-go mod tidy -compat=1.18