Change build runs-on

Author: girishpanchal30

.github/workflows/test-e2e.yml

@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
       matrix:
           env: ["default","gutenberg", "gutenberg-datatable"]
-    runs-on: ubuntu-16.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2