Merge pull request #3373 from verilog-to-routing/feature-ci

[CI] Added Dependabot for GitHub Actions

Author: AlexandreSinger

.github/dependabot.yml

@@ -9,4 +9,12 @@ updates:
         interval: "monthly"
 
     # Update all submodules
-    directory: /
+    directory: /
+
+  # This will create a PR if there are any updates to the actions used in the CI.
+  - package-ecosystem: "github-actions"
+    # Workflow files stored in the default location of `.github/workflows`
+    directory: "/"
+    # Check for updates once a week
+    schedule:
+      interval: "weekly"