Temporarily set the schedule interval to daily to see it works

After seeing the test action, this commit will be dropped.

Author: wkliao

.github/dependabot.yml

@@ -3,6 +3,6 @@ updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "monthly"
+      interval: "daily"
     cooldown:
-      default-days: 7
+      default-days: 1