Bump flat from 5.0.2 to 6.0.0 #1605

Job	Run time
run (admin-ui, lint)	2m 31s
run (admin-ui, test)	1m 42s
run (admin-ui, build)	2m 8s
run (admin-ui, cy:check-types)	1m 42s
run (admin-ui, cy:run-component)	2m 18s
run (account-ui, lint)	1m 39s
run (account-ui, build)	1m 48s
run (@keycloak/keycloak-admin-client, lint)	1m 50s
run (@keycloak/keycloak-admin-client, build)	1m 21s
run (keycloak-masthead, lint)	1m 20s
run (keycloak-masthead, build)	1m 31s
dependabot	2s
	19m 52s

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