Update dependency ember-qunit to v5.1.5

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-qunit	5.1.4 -> 5.1.5

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Release Notes

emberjs/ember-qunit

### [`v5.1.5`](https://togithub.com/emberjs/ember-qunit/blob/master/CHANGELOG.md#v515-2021-10-06) [Compare Source](https://togithub.com/emberjs/ember-qunit/compare/v5.1.4...v5.1.5) ##### :bug: Bug Fix - [#​900](https://togithub.com/emberjs/ember-qunit/pull/900) Remove usage of APIs removed in Ember >= 4 ([@​chancancode](https://togithub.com/chancancode)) ##### :memo: Documentation - [#​883](https://togithub.com/emberjs/ember-qunit/pull/883) Update migration documentation to add arguments to the example migrated functions ([@​Oluwadamilareolusakin](https://togithub.com/Oluwadamilareolusakin)) - [#​856](https://togithub.com/emberjs/ember-qunit/pull/856) Add ember-auto-import mention to migration docs ([@​rwjblue](https://togithub.com/rwjblue)) ##### :house: Internal - [#​901](https://togithub.com/emberjs/ember-qunit/pull/901) Use ember-auto-import@2 to test ember-source >= 4 ([@​rwjblue](https://togithub.com/rwjblue)) ##### Committers: 5 - Godfrey Chan ([@​chancancode](https://togithub.com/chancancode)) - Robert Jackson ([@​rwjblue](https://togithub.com/rwjblue)) - Stefan Penner ([@​stefanpenner](https://togithub.com/stefanpenner)) - Tolulope Oluwadamilare Olusakin ([@​Oluwadamilareolusakin](https://togithub.com/Oluwadamilareolusakin)) - [@​dependabot-preview\[bot\]](https://togithub.com/apps/dependabot-preview)

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