RubyGems: Dependency repository hijacking aka Repo Jacking from GitHub repo rubygems/bundler-site & rubygems/bundler.github.io + bundler.io docs

Dependency repository hijacking aka repo jacking is an obscure supply chain vulnerability, conceptually similar to subdomain takeover. When the linked repository owner changes their username, it becomes immediately available to be re-registered by anyone. This means that any project that linked...