I update nextcloud server package from 13.0.3 to 13.0.4 for Debian Jessie and Stretch.

Update proces is same as before, check on link.

This mini patch coming very fast after 13.0.3 :-)

Changes

• Allow setting notify credentials in environment (server#9788)
• Make the token expiration also work for autocasting 0 (server#9803)
• Enable caldav for webdav subtree public-calendars (server#9820)