Bump node version for GH deploy action

Author: Gyanreyer

.github/workflows/deploy.yml

@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3
         with:
-          node-version: 16
+          node-version: 20
       - name: Install dependencies
         run: npm ci
       - name: Build site