Update actions/setup-node action to v6 (#318)

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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v6
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
       - name: Cache node modules
@@ -40,7 +40,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v6
       - name: Use Node.js 22
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: 22.22.0
       - name: Cache node modules
@@ -60,7 +60,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v6
       - name: Use Node.js 22
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: 22.22.0
       - name: Cache node modules