Dear maintainers, @brgl,

I noticed that the the libgpiod cxx bindings have been re-licensed from LGPLv2+ to LGPLv3+ starting from version 2.0.
https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/commit/bindings/cxx/gpiod.hpp?id=ea84f882d5d39b734a5756b3a6950da4896b9a0a

I think this should be in reflected in the LICENSE line of
libgpiod_2.1.bb which currently lists only

LICENSE = "GPL-2.0-or-later & LGPL-2.1-or-later & CC-BY-SA-4.0"