* This affects primarily Authelia instances running behind Traefik or
nginx ingress controllers within Kubernetes because those proxies
require that Authelia returns 302 instead of 401 after the session
has been inactive for too long.
* fixes#909
* fixed activity timestamp not being updated when accessing forbidden resources.
* fix inactivity not updated when user was inactive for too long.
* cover inactivity timeout updates with unit tests.
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