fdo#81095 update our copy of Source Sans Pro

Change-Id: Ifea8069b9d499cb7b23575786350446e85771eb6
(cherry picked from commit e842914ae3ec6109e889cfc4d0387192a68d2907)
Reviewed-on: https://gerrit.libreoffice.org/10183
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>