Merge pull request #12051 from kurtmckee/add-dependabot-for-actions

Add a dependabot config to update CI actions monthly

Author: pradyunsg

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"