Update dependency ember-cli-app-version to v6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-cli-app-version	5.0.0 -> 6.0.0

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Release Notes

ember-cli/ember-cli-app-version

### [`v6.0.0`](https://togithub.com/ember-cli/ember-cli-app-version/blob/HEAD/CHANGELOG.md#v600-2023-02-02) [Compare Source](https://togithub.com/ember-cli/ember-cli-app-version/compare/v5.0.0...v6.0.0) ##### :boom: Breaking Change - [#​388](https://togithub.com/ember-cli/ember-cli-app-version/pull/388) Drop support for Ember versions below v3.28, Drop support for Node versions below v14 ([@​rpemberton](https://togithub.com/rpemberton)) ##### :rocket: Enhancement - [#​398](https://togithub.com/ember-cli/ember-cli-app-version/pull/398) Remove use of `@ember/string` to avoid `ember-string.add-package` deprecation ([@​bertdeblock](https://togithub.com/bertdeblock)) ##### :house: Internal - [#​392](https://togithub.com/ember-cli/ember-cli-app-version/pull/392) Remove `config/environment.js` entry from `files` in `package.json` file ([@​bertdeblock](https://togithub.com/bertdeblock)) ##### Committers: 3 - Bert De Block ([@​bertdeblock](https://togithub.com/bertdeblock)) - Katie Gengler ([@​kategengler](https://togithub.com/kategengler)) - rpemberton ([@​rpemberton](https://togithub.com/rpemberton))

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