Upgrade to GitHub-native Dependabot

[dependabot-preview[bot]]

Dependabot Preview will be shut down on August 3rd, 2021. In order to keep getting Dependabot updates, please merge this PR and migrate to GitHub-native Dependabot before then.

Dependabot has been fully integrated into GitHub, so you no longer have to install and manage a separate app. This pull request migrates your configuration from Dependabot.com to a config file, using the new syntax. When merged, we'll swap out dependabot-preview (me) for a new dependabot app, and you'll be all set!

With this change, you'll now use the Dependabot page in GitHub, rather than the Dependabot dashboard, to monitor your version updates, and you'll configure Dependabot through the new config file rather than a UI.

If you've got any questions or feedback for us, please let us know by creating an issue in the dependabot/dependabot-core repository.

Learn more about migrating to GitHub-native Dependabot

Please note that regular @dependabot commands do not work on this pull request.

[coveralls]

Coverage increased (+0.008%) to 99.057% when pulling ac337900117b4241d6aa45f1bae9f52138a70f6e on dependabot/add-v2-config-file into 37e1998b23f722d04e1090c78691cd3fd9e98975 on master.

[coveralls]

Coverage increased (+0.01%) to 99.061% when pulling ac337900117b4241d6aa45f1bae9f52138a70f6e on dependabot/add-v2-config-file into 37e1998b23f722d04e1090c78691cd3fd9e98975 on master.