Ignore DisallowedHost on Sentry

https://sentry.io/organizations/teklia/issues/1786557534/
https://sentry.io/organizations/teklia/issues/1786774307/
https://sentry.io/organizations/teklia/issues/1786849974/
https://sentry.io/organizations/teklia/issues/1813798492/
https://sentry.io/organizations/teklia/issues/1799938153/

Bots are regularly sending weird requests to us, and it seems putting unexpected hosts in the Host: header causes a 404 error. However, on Django's side, a django.security.DisallowedHost exception occurs and is reported by Sentry.