chore(deps): ember-cli

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ember-cli (source)	devDependencies	patch	3.21.0 -> 3.21.1

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Release Notes

ember-cli/ember-cli

### [`v3.21.1`](https://togithub.com/ember-cli/ember-cli/blob/master/CHANGELOG.md#v3211) [Compare Source](https://togithub.com/ember-cli/ember-cli/compare/v3.21.0...v3.21.1) ##### Blueprint Changes - [`ember new` diff](https://togithub.com/ember-cli/ember-new-output/compare/v3.21.0...v3.21.1) - [`ember addon` diff](https://togithub.com/ember-cli/ember-addon-output/compare/v3.21.0...v3.21.1) ##### Changelog - [#​9321](https://togithub.com/ember-cli/ember-cli/pull/9321) Add missing `ember-lts-3.20` matrix build to CI configuration. [@​kellyselden](https://togithub.com/kellyselden) - [#​9323](https://togithub.com/ember-cli/ember-cli/pull/9323) Remove errant `ember-lts-3.12` matrix build from CI configuration. [@​rwjblue](https://togithub.com/rwjblue) - [#​9324](https://togithub.com/ember-cli/ember-cli/pull/9324) Fix transpilation issues with modern browsers by migrating from `ember-cli-uglify` to `ember-cli-terser` [@​rwjblue](https://togithub.com/rwjblue) Thank you to all who took the time to contribute!

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