chore: fix node version for shipjs

Author: egoist

.github/workflows/shipjs-trigger.yml

@@ -16,6 +16,7 @@ jobs:
       - uses: actions/setup-node@v1
         with:
           registry-url: 'https://registry.npmjs.org'
+          node-version: '14'
       - run: |
           if [ -f "yarn.lock" ]; then
             yarn install