Update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/deploy.yml

@@ -16,7 +16,7 @@ jobs:
           java-version: 21
           distribution: temurin
       - name: Setup Node.js 🟢
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: 20
       - name: Cache Minecraft server files 💾