Update actions/setup-node action to v6 [skip netlify]

Author: renovate[bot]

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: Use Node LTS
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 'lts/*'
           cache: 'npm'
@@ -30,7 +30,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: Use Node LTS
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 'lts/*'
           cache: 'npm'