Update dependabot.yml (Fix #13939) (#13990)

* Update dependabot.yml

* Update dependabot.yml

.github/dependabot.yml

@@ -1,7 +1,11 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
 version: 2
 updates:
-
-- package-ecosystem: npm
+  - package-ecosystem: npm
     directory: "/"
     schedule:
       interval: weekly
@@ -9,7 +13,7 @@ updates:
     allow:
       - dependency-type: all
 
-- package-ecosystem: bundler
+  - package-ecosystem: bundler
     directory: "/"
     schedule:
       interval: weekly