chore(deps): update actions/setup-node action to v6 (#449)

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

Author: renovate[bot]

.github/actions/prepare/action.yml

@@ -4,7 +4,7 @@ runs:
   using: "composite"
   steps:
     - name: with Node.js 16 on ubuntu-latest
-      uses: actions/setup-node@v5
+      uses: actions/setup-node@v6
       with:
         node-version: 22.x
         cache: "npm"

.github/workflows/release-npm.yml

@@ -19,7 +19,7 @@ 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-javascript.yml

@@ -38,7 +38,7 @@ jobs:
         run: git config --global core.autocrlf input
       - 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 }}
       - run: npm ci
@@ -64,7 +64,7 @@ jobs:
         run: git config --global core.autocrlf input
       - uses: actions/checkout@v5
       - name: with Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
       - run: npm ci