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-javascript.yml

@@ -37,7 +37,7 @@ 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"

.github/workflows/test-testdata.yml

@@ -20,7 +20,7 @@ jobs:
 
     - uses: actions/checkout@v5
 
-    - uses: actions/setup-node@v5
+    - uses: actions/setup-node@v6
       with:
         cache: 'npm'
         cache-dependency-path: testdata/package-lock.json