chore: update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/CI.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v5
     - name: Install Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v5
+      uses: actions/setup-node@v6
       with:
         node-version: ${{ matrix.node-version }}
         cache: 'npm'

.github/workflows/RELEASE.yml

@@ -31,7 +31,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v5
       - name: Use Node.js
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 20
           cache: 'npm'