According to https://github.blog/2020-06-01-keep-all-your-packages-up-to-date-with-dependabot/, Dependabot is now “GitHub-native”.
Will Dependabot be made available for self-hosted GitHub Enterprise?
You can see that this is a popular request from the reactions and comments on https://github.com/dependabot/dependabot-core/issues/1499.