Build(deps-dev): Bump ember-cli from 3.9.0 to 3.15.1#235

dependabot-preview[bot] wants to merge 1 commit intomasterember-cli/ember-load-initializers:masterfrom

dependabot/npm_and_yarn/ember-cli-3.15.1ember-cli/ember-load-initializers:dependabot/npm_and_yarn/ember-cli-3.15.1Copy head branch name to clipboard