chore: harden dependabot updates

.github/dependabot.yml

@@ -0,0 +1,40 @@
+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: weekly
+      day: monday
+      time: "09:00"
+      timezone: Asia/Shanghai
+    open-pull-requests-limit: 5
+    versioning-strategy: increase-if-necessary
+    commit-message:
+      prefix: chore
+      include: scope
+    labels:
+      - dependencies
+      - npm
+    groups:
+      app-dependencies:
+        patterns:
+          - "*"
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+      day: monday
+      time: "09:30"
+      timezone: Asia/Shanghai
+    open-pull-requests-limit: 3
+    commit-message:
+      prefix: chore
+      include: scope
+    labels:
+      - dependencies
+      - github-actions
+    groups:
+      github-actions:
+        patterns:
+          - "*"