build(deps): bump actions/setup-node from 4 to 6

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 4 to 6.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](https://github.com/actions/setup-node/compare/v4...v6)

---
updated-dependencies:
- dependency-name: actions/setup-node
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci-platform.yml

@@ -42,7 +42,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: "20"
       - name: npm install and build

.github/workflows/ci-security.yml

@@ -42,7 +42,7 @@ jobs:
         working-directory: web/delivery-platform-ui
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: "20"
           cache: npm

services/pom.xml

@@ -20,7 +20,7 @@
         <java.version>17</java.version>
         <spring-boot.version>4.0.0</spring-boot.version>
         <!-- 平台数据访问：PostgreSQL 15 + MyBatis-Plus（Spring Boot 4 用 boot4-starter） -->
-        <mybatis-plus.version>3.5.16</mybatis-plus.version>
+        <mybatis-plus.version>3.5.15</mybatis-plus.version>
     </properties>
 
     <!--