Update testcoverage.yml

.github/workflows/testcoverage.yml

@@ -14,7 +14,7 @@ jobs:
           fetch-depth: 0 # otherwise, you will failed to push refs to dest repo:  
       - uses: actions/setup-node@v1
         with:
-          node-version: 12
+          node-version: 16
           registry-url: https://registry.npmjs.org/
       - run: npm install
       - run: npm test