Update from debian/buster-security for apertis/v2021-security

Signed-off-by: Ritesh Raj Sarraf <ritesh.sarraf@collabora.com>

Merge remote-tracking branch 'origin/apertis/v2021-security' into proposed-updates/debian/buster-security/d17054db

* origin/apertis/v2021-security:
  Release xorg-server version 2:1.20.4-1+deb10u3+apertis1
  Refresh the automatically detected licensing information
  d/a/copyright: Add missing copyright information
  Release xorg-server version 2:1.20.4-1+deb10u2+apertis1
  Releasing apertis version 1.20.4-1+deb10u1co1.
  debian/apertis/component: Set to target
  Release xorg-server version 2:1.20.4-1co1
  Import Apertis version 1.20.3-1co1