ci: use v16

Author: velopert

.github/workflows/main.yml

@@ -1,4 +1,4 @@
-name: Deploy Serverless SSR
+name: Deploy
 
 on:
   push:
@@ -11,6 +11,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@master
+    - name: Setup Node.js 16.x
+      uses: actions/setup-node@v2
+      with:
+        node-version: '16.x'
     - name: Get yarn cache
       id: yarn-cache
       run: echo "::set-output name=dir::$(yarn cache dir)"