chore(deps): update dependency qunit to v2.20.0 #2255

Job	Run time
Lint Test App	31s
Lint Addon	41s
embroider-optimized - Allowed to fail	1m 31s
Tests (Floating Dependencies)	1m 1s
ember-beta - Allowed to fail	1m 24s
Tests (ember-4.0, false)	1m 15s
ember-canary - Allowed to fail	1m 15s
Tests (ember-lts-4.4, false)	1m 29s
Tests (ember-lts-4.8, false)	1m 16s
Tests (ember-4.12, false)	1m 16s
Tests (ember-default, false)	52s
Tests (ember-release, false)	1m 19s
Tests (embroider-safe, false)	1m 13s
	15m 3s

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