chore: Upgrade to GitHub-native Dependabot (#124)

_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 updates your config file to the [new syntax][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][dependabot_page], rather than the [Dependabot dashboard][dashboard], to monitor your version updates, and you'll configure Dependabot through the new config file rather than a UI.



Your account was configured to allow an unlimited number of open pull requests. This option is no longer supported in the new config file so it has been changed to `99`.




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

[Learn more about migrating to GitHub-native Dependabot][learn]

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

[dashboard]: https://app.dependabot.com/
[dependabot_page]: https://github.com/relaycorp/awala-cogrpc-jvm/network/updates
[issues]: https://github.com/dependabot/dependabot-core/issues/new?assignees=%40dependabot%2Fpreview-migration-reviewers&labels=E%3A+preview-migration&template=migration-issue.md
[learn]: http://docs.github.com/code-security/supply-chain-security/upgrading-from-dependabotcom-to-github-native-dependabot
[new_syntax]: https://help.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates
[org_secrets_url]: https://github.com/organizations/relaycorp/settings/secrets/dependabot
[repo_secrets_url]: https://github.com/relaycorp/awala-cogrpc-jvm/settings/secrets/dependabot

Author: dependabot-preview[bot]

.dependabot/config.yml

@@ -0,0 +1,9 @@
+version: 2
+updates:
+- package-ecosystem: gradle
+  directory: "/"
+  schedule:
+    interval: weekly
+    time: "08:00"
+    timezone: Etc/UCT
+  open-pull-requests-limit: 99

.github/dependabot.yml

@@ -8,4 +8,4 @@ title = "pull_request_title"
 body = "pull_request_body"
 
 [approve]
-auto_approve_usernames = ["dependabot-preview", "dependabot", "gnarea"]
+auto_approve_usernames = ["dependabot", "gnarea"]