Update microfrontend image to have Node:12 version (#459)

Author: schenedx

docker-compose.yml

@@ -325,7 +325,6 @@ services:
  file: microfrontend.yml
  service: microfrontend
  working_dir: '/edx/app/program-manager'
- image: node:12
  container_name: edx.devstack.program-manager
  ports:
  - "1976:1976"

microfrontend.yml

@@ -5,6 +5,6 @@ version: "2.1"
 services:
  microfrontend:
  command: bash -c 'npm install && npm run start'
- image: node:10
+ image: node:12
  environment:
  - NODE_ENV=development