Merge pull request #923 from k8s-infra-cherrypick-robot/cherry-pick-915-to-release-1.21

[release-1.21] chore: add dependabot

Author: andyzhangx

.github/dependabot.yaml

@@ -0,0 +1,20 @@
+version: 2
+updates:
+- package-ecosystem: gomod
+  directory: "/"
+  schedule:
+    interval: daily
+  labels:
+    - "area/dependency"
+    - "release-note-none"
+    - "ok-to-test"
+  open-pull-requests-limit: 1
+- package-ecosystem: "github-actions"
+  directory: "/"
+  schedule:
+      interval: "daily"
+  labels:
+    - "area/dependency"
+    - "release-note-none"
+    - "ok-to-test"
+  open-pull-requests-limit: 1