Bump @testing-library/jest-dom from 5.17.0 to 6.0.0 in /js #954

Job	Run time
Check conditional workflows and jobs	9s
Admin Client	1m 49s
Build Keycloak	10m 53s
Account UI	2m 0s
Admin UI	4m 2s
Keycloak JS	1m 9s
Keycloak Masthead	1m 16s
UI Shared	1m 46s
Admin UI E2E	0s
Set check conclusion	0s
Status Check - Keycloak JavaScript CI	10s
	23m 14s

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