chore(deps): stable ember infrastructure (minor)

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ember-cli (source)	devDependencies	minor	3.20.1 -> 3.21.0
eslint-plugin-ember	devDependencies	minor	8.12.0 -> 8.13.0

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Release Notes

ember-cli/ember-cli

### [`v3.21.0`](https://togithub.com/ember-cli/ember-cli/blob/master/CHANGELOG.md#v3210) [Compare Source](https://togithub.com/ember-cli/ember-cli/compare/v3.20.1...v3.21.0) ##### Blueprint Changes - [`ember new` diff](https://togithub.com/ember-cli/ember-new-output/compare/v3.20.1...v3.21.0) - [`ember addon` diff](https://togithub.com/ember-cli/ember-addon-output/compare/v3.20.1...v3.21.0) ##### Changelog - [#​9305](https://togithub.com/ember-cli/ember-cli/pull/9305) Update blueprint dependencies to latest versions. [@​rwjblue](https://togithub.com/rwjblue) - [#​9306](https://togithub.com/ember-cli/ember-cli/pull/9306) Ensure that `outputReady` receives the final output directory. [@​rwjblue](https://togithub.com/rwjblue) - [#​9308](https://togithub.com/ember-cli/ember-cli/pull/9308) Add Ember 3.20 LTS to ember-try configuration. [@​rwjblue](https://togithub.com/rwjblue) - [#​9309](https://togithub.com/ember-cli/ember-cli/pull/9309) Update blueprint dependencies to latest [@​rwjblue](https://togithub.com/rwjblue) - [#​9310](https://togithub.com/ember-cli/ember-cli/pull/9310) Drop Ember 3.12 from default addon testing matrix. [@​rwjblue](https://togithub.com/rwjblue) - [#​9259](https://togithub.com/ember-cli/ember-cli/pull/9259) Implement [emberjs/rfcs#​635](https://togithub.com/emberjs/rfcs/blob/master/text/0635-ember-new-lang.md): `ember new --lang` [@​josephdsumner](https://togithub.com/josephdsumner) - [#​9299](https://togithub.com/ember-cli/ember-cli/pull/9299) Remove explicit `yarn install` in blueprint generated `.travis.yml` (use the Travis CI default of `yarn install --frozen-lockfile`) [@​kellyselden](https://togithub.com/kellyselden) - [#​9289](https://togithub.com/ember-cli/ember-cli/pull/9289) Update blueprint dependencies / devDependencies [@​rwjblue](https://togithub.com/rwjblue)

ember-cli/eslint-plugin-ember

### [`v8.13.0`](https://togithub.com/ember-cli/eslint-plugin-ember/blob/master/CHANGELOG.md#v8130-2020-08-26) [Compare Source](https://togithub.com/ember-cli/eslint-plugin-ember/compare/v8.12.0...v8.13.0) ##### :rocket: Enhancement - [#​920](https://togithub.com/ember-cli/eslint-plugin-ember/pull/920) Add new rule [no-noop-setup-on-error-in-before](https://togithub.com/ember-cli/eslint-plugin-ember/blob/master/docs/rules/no-noop-setup-on-error-in-before.md) ([@​v-korshun](https://togithub.com/v-korshun)) ##### :bug: Bug Fix - [#​923](https://togithub.com/ember-cli/eslint-plugin-ember/pull/923) Fix crash with spread syntax in [no-actions-hash](https://togithub.com/ember-cli/eslint-plugin-ember/blob/master/docs/rules/no-actions-hash.md) rule ([@​bmish](https://togithub.com/bmish)) ##### Committers: 2 - Bryan Mishkin ([@​bmish](https://togithub.com/bmish)) - Viktar ([@​v-korshun](https://togithub.com/v-korshun))

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