chore(deps): update dependency eslint-plugin-qunit to v8 #2220

Job	Run time
Tests (Floating Dependencies)	1m 35s
Lint Test App	31s
Tests (ember-4.0, false)	1m 34s
embroider-optimized - Allowed to fail	1m 27s
Tests (ember-lts-4.4, false)	1m 38s
ember-beta - Allowed to fail	1m 25s
Lint Addon	30s
Tests (ember-lts-4.8, false)	1m 20s
ember-canary - Allowed to fail	1m 12s
Tests (ember-4.12, false)	1m 17s
Tests (ember-default, false)	1m 14s
Tests (ember-release, false)	2m 3s
Tests (embroider-safe, false)	1m 8s
	16m 54s

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