chore(assistant): update dependency @types/testing-library__jest-dom to v6 #5250

Job	Run time
install	1m 25s
build	3m 17s
unit-tests	36s
lint	1m 26s
integration-tests-playwright	0s
integration-tests-cypress	0s
unit-tests-a11y	0s
integration-tests-assistant	0s
unit-tests-playwright	0s
unit-tests-cypress	0s
unit-tests-runner-flutter	0s
release	0s
publish-docs	0s
publish-npm	0s
publish-intellij	0s
publish-vscode	0s
	6m 44s

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