chore(deps): update dependency ember-cli to v3.15.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ember-cli (source)	devDependencies	patch	3.15.0 -> 3.15.1

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Release Notes

ember-cli/ember-cli

### [`v3.15.1`](https://togithub.com/ember-cli/ember-cli/releases/v3.15.1) [Compare Source](https://togithub.com/ember-cli/ember-cli/compare/v3.15.0...v3.15.1) ##### Blueprint Changes - [`ember new` diff](https://togithub.com/ember-cli/ember-new-output/compare/v3.15.0...v3.15.1) - [`ember addon` diff](https://togithub.com/ember-cli/ember-addon-output/compare/v3.15.0...v3.15.1) ##### Changelog - [#​8977](https://togithub.com/ember-cli/ember-cli/pull/8977) Fix invalid syntax with ember-classic ember-try scenario. [@​rwjblue](https://togithub.com/rwjblue)

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