Security vulnerability with braces package

[kstinson14]

We're running into security vulnerabilities from <v3.0.3 versions of the braces package. Checking out our dependency chain, it looks like it should be fixed if

• broccoli updates sane (there already exists a PR to do so) and then ember-cli pulls in the update.
• ember-cli-dependency-checker updates find-yarn-workspace-root to v2.0.0.
  

[kategengler]

In the meantime, you can use npm overrides to solve this. It is also worth noting that this code only runs in development.