chore(deps): update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/release-npm.yml

@@ -15,7 +15,7 @@ jobs:
     environment: Release
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: '24.x'
           cache: 'npm'

.github/workflows/test.yml

@@ -32,7 +32,7 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: with Node.js ${{ matrix.node-version }} on ${{ matrix.os }}
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
           cache: "npm"