downgraded Node.js version in Dockerfile

1 job for develop in 1 second (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #20740
node npm angular
coverage

00:00:01

 
Name Stage Failure
failed
coverage Test
Running with gitlab-runner 12.2.0 (a987417a)
on callidus-frontend-ci VBpFtRQZ
Using Docker executor with image 10.19.0-stretch ...
Pulling docker image 10.19.0-stretch ...
ERROR: Job failed: Error response from daemon: pull access denied for 10.19.0-stretch, repository does not exist or may require 'docker login': denied: requested access to the resource is denied (executor_docker.go:192:1s)