Bump @patternfly/react-core from 4.276.6 to 6.0.0 #2328

Job	Run time
run (admin-ui, lint)	1m 4s
run (admin-ui, test)	55s
run (admin-ui, build)	1m 29s
run (admin-ui, cy:check-types)	1m 14s
run (admin-ui, cy:run-component)	1m 6s
run (account-ui, lint)	1m 30s
run (account-ui, build)	1m 25s
run (@keycloak/keycloak-admin-client, lint)	1m 26s
run (@keycloak/keycloak-admin-client, build)	1m 19s
run (keycloak-masthead, lint)	55s
run (keycloak-masthead, build)	50s
dependabot	0s
	13m 13s

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