Update from debian/buster for apertis/v2021-updates

xorg-server (2:1.20.4-1+deb10u2) buster-security; urgency=medium

• CVE-2020-14360 CVE-2020-25712

debian/apertis/copyright.yml

-Xext/*:
+.*:
   license: MIT
-Xext/Makefile.in:
-  license: FSFULLR
-Xi/*:
-  license: MIT
-Xi/Makefile.in:
+.*Makefile.in:
   license: FSFULLR
+hw/dmx/config/parser.c:
+  override-license: GPL-3+ WITH Bison-exception-2.2
+hw/dmx/config/parser.h:
+  override-license: GPL-3+ WITH Bison-exception-2.2
+hw/xwin/winprefsyacc.c:
+  override-license: GPL-3+ WITH Bison-exception-2.2
+hw/xwin/winprefsyacc.h:
+  override-license: GPL-3+ WITH Bison-exception-2.2