Bump ember-cli from 3.6.1 to 3.7.1

Bumps [ember-cli](https://github.com/ember-cli/ember-cli) from 3.6.1 to 3.7.1.
- [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@v3.6.1...v3.7.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -21,7 +21,7 @@
     "@ember/jquery": "^0.5.2",
     "@ember/optional-features": "^0.6.3",
     "broccoli-asset-rev": "^3.0.0",
-    "ember-cli": "~3.6.1",
+    "ember-cli": "~3.7.1",
     "ember-cli-app-version": "^3.2.0",
     "ember-cli-babel": "^7.2.0",
     "ember-cli-content-security-policy": "^1.0.0",