Upgrade to node 16.x for GitHub CI

Signed-off-by: Bernd Hufmann <bernd.hufmann@ericsson.com>

Author: bhufmann

.github/workflows/ci-cd.yml

@@ -20,7 +20,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-18.04]
-        node: [12]
+        node: [16.x]
 
     steps:
       - name: Checkout