V5 is a small refactor renaming.
// old v4
const { login, logout, isLogged} = useOidc();
const{ oidcUser, isOidcUserLoading, isLogged } = useOidcUser();
// in v5 become
const { login, logout, isAuthenticated} = useOidc();
const{ oidcUser, oidcUserLoadingState } = useOidcUser();
callbackErrorComponent is replaced by authenticatingErrorComponent n OidcProvider component.