Update dependabot.yml

.github/dependabot.yml

@@ -6,13 +6,12 @@ updates:
       interval: weekly
       day: monday
       time: "03:00"
-    open-pull-requests-limit: 10
-    versioning-strategy: increase
-  - package-ecosystem: bundler
-    directory: "/docs/"
-    schedule:
-      interval: weekly
-      day: monday
-      time: "03:00"
+    groups:
+      dev-dependencies:
+        patterns:
+            - "eslint"
+            - "stylelint"
+            - "prettier"
+            - "postcss"
     open-pull-requests-limit: 10
     versioning-strategy: increase