Tidy up dependabot config

Author: garryod

.github/dependabot.yaml

@@ -5,10 +5,10 @@
 
 version: 2
 updates:
-  - package-ecosystem: "github-actions"
-    directory: "/" 
+  - package-ecosystem: github-actions
+    directory: /
     schedule:
-      interval: "monthly"
+      interval: monthly
     open-pull-requests-limit: 100
     groups:
       github-artifacts:
@@ -18,11 +18,10 @@ updates:
         update-types:
           - minor
           - patch
-
-  - package-ecosystem: "npm"
-    directory: "/backstage/"
+  - package-ecosystem: npm
+    directory: backstage
     schedule:
-      interval: "monthly"
+      interval: monthly
     open-pull-requests-limit: 100
     groups:
       minor: