Update node version to latest LTS for e2e tests.

Author: onurtemizkan

.github/workflows/build.yml

@@ -286,7 +286,7 @@ jobs:
       - name: Set up Node
         uses: actions/setup-node@v1
         with:
-          node-version: '12'
+          node-version: '16'
           fetch-depth: 0
       - name: Check dependency cache
         uses: actions/cache@v2