Update dependency ember-test-selectors to v5

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ember-test-selectors	devDependencies	major	^4.0.0 -> ^5.0.0

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Release Notes

simplabs/ember-test-selectors

### [`v5.0.0`](https://togithub.com/simplabs/ember-test-selectors/blob/master/CHANGELOG.md#v500-2020-09-02) [Compare Source](https://togithub.com/simplabs/ember-test-selectors/compare/v4.1.0...v5.0.0) This release drops support for Ember.js versions below v3.8 due to an update of ember-cli-htmlbars which did the same. Other than that, no further breaking changes are contained in the release. ##### :boom: Breaking Change - [#​527](https://togithub.com/simplabs/ember-test-selectors/pull/527) Bump ember-cli-htmlbars from 4.3.1 to 5.1.2 ([@​marcoow](https://togithub.com/marcoow)) ##### :rocket: Enhancement - [#​587](https://togithub.com/simplabs/ember-test-selectors/pull/587) bind-data-test-attributes: Avoid deprecated `getWithDefault()` call ([@​Turbo87](https://togithub.com/Turbo87)) ##### :memo: Documentation - [#​588](https://togithub.com/simplabs/ember-test-selectors/pull/588) Update Node.js and Ember.js support documentation ([@​Turbo87](https://togithub.com/Turbo87)) ##### Committers: 2 - Marco Otte-Witte ([@​marcoow](https://togithub.com/marcoow)) - Tobias Bieniek ([@​Turbo87](https://togithub.com/Turbo87))

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