chore: Fix deploy-docs workflow (#825)

Author: taion

.github/workflows/deploy-docs.yml

@@ -9,9 +9,11 @@ jobs:
  runs-on: ubuntu-latest
  steps:
  - name: Checking out Repository
- uses: actions/checkout@v1
+ uses: actions/checkout@v2
  - name: Setup Node.js
  uses: actions/setup-node@v1
+ with:
+ node-version: 12.x
  - name: Install Dependencies
  run: yarn bootstrap
  - name: Build and Deploy Production Files