chore(deps): update dependency ember-cli-fastboot-testing to v0.6.2 #3432

Job	Run time
Lint Test App	28s
Tests (Floating Dependencies)	1m 15s
Lint Addon	32s
embroider-optimized - Allowed to fail	59s
ember-beta - Allowed to fail	1m 13s
Tests (ember-4.0, false)	52s
ember-canary - Allowed to fail	1m 41s
Tests (ember-lts-4.4, false)	1m 25s
Tests (ember-lts-4.8, false)	45s
Tests (ember-4.12, false)	2m 6s
Tests (ember-lts-5.8, false)	1m 15s
Tests (ember-default, false)	43s
Tests (ember-release, false)	52s
Tests (embroider-safe, false)	57s
	15m 3s

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