chore(deps): update dependency ember-cli-showdown to v8 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-cli-showdown	^6.0.1 -> ^8.1.0

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Release Notes

empress/ember-cli-showdown (ember-cli-showdown)

### [`v7.0.0`](https://togithub.com/empress/ember-cli-showdown/blob/HEAD/CHANGELOG.md#v700--2023-07-02) [Compare Source](https://togithub.com/empress/ember-cli-showdown/compare/v6.0.1...v7.0.0) \================== - update to v4.12 with ember-cli-update [#​128](https://togithub.com/empress/ember-cli-showdown/issues/128) from [@​mansona](https://togithub.com/mansona) - use ember-auto-import to import showdown [#​126](https://togithub.com/empress/ember-cli-showdown/issues/126) from [@​mansona](https://togithub.com/mansona) - breaking: drop support for node < 16 [#​127](https://togithub.com/empress/ember-cli-showdown/issues/127) from [@​mansona](https://togithub.com/mansona)

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Configuration

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