chore(deps-dev): bump ember-cli from 3.10.1 to 3.15.2 (#3974)

Bumps [ember-cli](https://github.com/ember-cli/ember-cli) from 3.10.1 to 3.15.2.
- [Release notes](https://github.com/ember-cli/ember-cli/releases)
- [Changelog](https://github.com/ember-cli/ember-cli/blob/master/CHANGELOG.md)
- [Commits](ember-cli/ember-cli@v3.10.1...v3.15.2)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package.json

@@ -33,7 +33,7 @@
     "broccoli-persistent-filter": "^2.0.0",
     "ember-ajax": "5.0.0",
     "ember-auto-import": "^1.5.3",
-    "ember-cli": "~3.10.1",
+    "ember-cli": "~3.15.2",
     "ember-cli-accounting": "^2.0.2",
     "ember-cli-app-version": "^3.2.0",
     "ember-cli-autoprefixer": "0.8.1",