Update dependency node to v26

.github/workflows/renovate.yaml

@@ -22,7 +22,7 @@ jobs:
       - name: setup node
         uses: actions/setup-node@v6
         with:
-          node-version: '24'
+          node-version: '26'
       - run: npm install -g renovate
       - name: Run Renovate
         run: renovate --token=${{ secrets.THIS_TOKEN }} --endpoint=https://gitea.ssig33.com --platform=gitea --autodiscover --autodiscover-filter ${{ github.repository }}