GitHub just shipped a feature to disable Dependabot updates on your forks[1]. If you're like me, you've found Dependabot opening PRs on your Beam fork annoying; to fix this, go to https://github.com/<your username>/beam/settings/security_analysis and disable Dependabot version updates.
This will automatically get applied to any new forks. Thanks, Danny [1] https://github.com/dependabot/dependabot-core/issues/2804#issuecomment-1306143227