Update dependency ember-cli to v4.8.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-cli (source)	4.8.0 -> 4.8.1

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Release Notes

ember-cli/ember-cli (ember-cli)

### [`v4.8.1`](https://redirect.github.com/ember-cli/ember-cli/releases/tag/v4.8.1): Release 4.8.1 [Compare Source](https://redirect.github.com/ember-cli/ember-cli/compare/v4.8.0...v4.8.1) ##### Blueprint Changes - [`ember new` diff](https://redirect.github.com/ember-cli/ember-new-output/compare/v4.8.0...v4.8.1) - [`ember addon` diff](https://redirect.github.com/ember-cli/ember-addon-output/compare/v4.8.0...v4.8.1) ##### Changelog - [#​10313](https://redirect.github.com/ember-cli/ember-cli/pull/10313) \[BUGFIX] Do not try to wire up Testem unless a test framework is dete… [@​NullVoxPopuli](https://redirect.github.com/NullVoxPopuli) Thank you to all who took the time to contribute!

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Configuration

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