Override and add missing license information

Override and include missing license information to reflect reality.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>

debian/apertis/copyright.yml

+docs/random/classes.dia:
+    license: LGPL-2+
+docs/random/wtay/*:
+    license: LGPL-2+
+tests/benchmarks/complexity.scm:
+    override-license: LGPL-2.1+
+tests/benchmarks/mass-elements.scm:
+    override-license: LGPL-2.1+
+tests/misc/network-clock.scm:
+    override-license: GPL-2