Log Message:
davical: update to 1.1.9.3

upstream changes:
-----------------
2020-04-04 Florian Schlichting <fsfs@debian.org>
  * LSID logins were removed from AWL, drop related bits in davical
2019-12-06 Florian Schlichting <fsfs@debian.org>
  * use foreach() instead of deprecated each() (fixes #190)
  * HTTP_REFERER will usually be unset for caldav requests, prevent \ 
"Undefined index" warnings