Update github action's node version to 14

Author: stevenguh

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
 
       - uses: actions/setup-node@v1
         with:
-          node-version: '12.x'
+          node-version: 14
 
       - uses: bahmutov/npm-install@v1