Update dependabot.yml

added "github-actions" ecosystem

.github/dependabot.yml

@@ -3,6 +3,12 @@ updates:
   - package-ecosystem: bundler
     directory: /
     schedule:
-      interval: daily
+      interval: "weekly"
     allow:
       - dependency-type: direct
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      # Check for updates to GitHub Actions every week
+      interval: "weekly"