update to solid-client-authn-browser > 15 (deprecation notice)

[bourgeoa]

https://github.com/inrupt/solid-client-authn-js/blob/main/CHANGELOG.md#deprecation-notice

Session methods onLogin, onLogout, onError, onSessionRestore, onSessionExpiration, onNewRefreshToken are deprecated in favor of session.events.on called with the appropriate event name.

Changes should be located mainly in https://github.com/SolidOS/solid-ui/blob/main/src/login/login.ts