Enable dependabot for Github Action Workflows

Signed-off-by: Jiahao XU <[email protected]>

Author: NobodyXu

Diff for: .github/dependabot.yml

@@ -1,5 +1,11 @@
 version: 2
 updates:
+- package-ecosystem: "github-actions"
+  # Workflow files stored in the
+  # default location of `.github/workflows`
+  directory: "/"
+  schedule:
+    interval: "daily"
 - package-ecosystem: cargo
   directory: "/"
   schedule: