feat(github-actions): set up weekly dependency updates

Configure Dependabot to perform weekly updates for GitHub Actions and Maven
dependencies. This ensures that all project dependencies are kept up to date,improving security and compatibility.

Author: linwumingshi

.github/dependabot.yml

@@ -0,0 +1,16 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "ci"
+
+
+  - package-ecosystem: "maven"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "dependencies"