Upgrade to GitHub-native Dependabot

dependabot-preview[bot] · 1480c1 · commit 9f34733d828a · 2021-04-29T16:13:58.000-05:00
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
@@ -0,0 +1,8 @@
+version: 2
+updates:
+- package-ecosystem: docker
+  directory: "/"
+  schedule:
+    interval: daily
+    time: "10:00"
+  open-pull-requests-limit: 10
