Update dependency ember-fetch to v8.1.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-fetch	8.1.1 -> 8.1.2

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Release Notes

ember-cli/ember-fetch

### [`v8.1.2`](https://togithub.com/ember-cli/ember-fetch/blob/HEAD/CHANGELOG.md#v812-2022-08-23) [Compare Source](https://togithub.com/ember-cli/ember-fetch/compare/v8.1.1...v8.1.2)

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Configuration

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