Change to Node.js v18

I thought this number was the npm version since the example code gives
v6.6.6, it should be the Node.js version.

The current LTS is 18.13.0, but it is not in the chrome-infra-packages
repository so I chose 18.11.0.

Change-Id: Ie0af17ef3fad3d87de22228cabdc85604c402849
2 files changed
tree: 5b210c435b17f5aef18efad1f60fff7522be7137
  1. generated/
  2. infra/
  3. recipes/
  4. .gitignore
  5. main.star