Auto merge of #2503 - rust-lang:dependabot/npm_and_yarn/ember-cli-3.18.0, r=Turbo87

Bump ember-cli from 3.17.0 to 3.18.0

Bumps [ember-cli](https://github.com/ember-cli/ember-cli) from 3.17.0 to 3.18.0.

[![Dependabot compatibility score](https://api.dependabot.com/badges/compatibility_score?dependency-name=ember-cli&package-manager=npm_and_yarn&previous-version=3.17.0&new-version=3.18.0)](https://dependabot.com/compatibility-score/?dependency-name=ember-cli&package-manager=npm_and_yarn&previous-version=3.17.0&new-version=3.18.0)

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

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<details>
<summary>Dependabot commands and options</summary>
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Author: bors