Update actions/setup-node action to v6 (#205)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/linter.yml

@@ -8,7 +8,7 @@ jobs:
     steps:
     - uses: actions/checkout@v5
     - name: Use Node.js
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@v6
     - name: Install Dependencies
       run: npm install
     - run: npm run eslint

.github/workflows/tester.yml

@@ -14,7 +14,7 @@ jobs:
         with:
           repository: hexojs/hexo-starter
       - name: Use Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
       - name: Install Dependencies
         run: npm install
       - name: Test