Fix Pronto on Dependabot pull requests
Fix Pronto on Dependabot pull requests

As explained in "GitHub Actions: Workflows triggered by Dependabot PRs
will run with read-only permissions" [1], we need to consider Dependabot
pull requests as external pull requests.

[1] https://github.blog/changelog/2021-02-19-github-actions-workflows-triggered-by-dependabot-prs-will-run-with-read-only-permissions/

consul/consul,consul/consul,consul/consul,consul/consul,consul/consul