Update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           cache: 'npm'
           node-version: ${{ matrix.node-version }}
@@ -42,7 +42,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Use Node.js LTS
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           cache: 'npm'
           node-version: 'lts/*'
@@ -81,7 +81,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Use Node.js LTS
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           cache: 'npm'
           node-version: 'lts/*'