Update node version in gh actions config

.github/workflows/deploy.yml

@@ -10,10 +10,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Use Node.js 12.x
+      - name: Use Node.js 16.x
         uses: actions/setup-node@v1
         with:
-          node-version: 12.x
+          node-version: 16.x
       - run: npm ci
       - run: npm run build
       - run: npm run sitemap

.github/workflows/test.yml

@@ -12,10 +12,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Use Node.js 12.x
+      - name: Use Node.js 16.x
         uses: actions/setup-node@v1
         with:
-          node-version: 12.x
+          node-version: 16.x
       - run: npm ci
       - run: npm run lint
       - run: npm run build