Update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
         uses: pnpm/action-setup@v4
 
       - name: Install node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node }}
           cache: pnpm

.github/workflows/deploy.yml

@@ -44,7 +44,7 @@ jobs:
             exit 1
           fi
       - name: Setup Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: "22"
           cache: ${{ steps.detect-package-manager.outputs.manager }}