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

Author: renovate[bot]

.github/workflows/astro.yml

@@ -42,7 +42,7 @@ jobs:
           echo "command=install" >> $GITHUB_OUTPUT
           echo "runner=yarn" >> $GITHUB_OUTPUT
       - name: Setup Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: 21
           cache: ${{ steps.detect-package-manager.outputs.manager }}

.github/workflows/node.js.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Use Node.js
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@v6
       with:
         node-version: 21
         cache: 'yarn'