Bump react-i18next from 12.2.0 to 15.1.0 #2327

Job	Run time
run (admin-ui, lint)	1m 17s
run (admin-ui, test)	1m 15s
run (admin-ui, build)	1m 32s
run (admin-ui, cy:check-types)	1m 12s
run (admin-ui, cy:run-component)	1m 24s
run (account-ui, lint)	1m 22s
run (account-ui, build)	1m 21s
run (@keycloak/keycloak-admin-client, lint)	1m 17s
run (@keycloak/keycloak-admin-client, build)	1m 13s
run (keycloak-masthead, lint)	1m 4s
run (keycloak-masthead, build)	1m 3s
dependabot	0s
	14m 0s

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