/usr/share/lintian/overrides/libgd3 is in libgd3 2.1.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1
libgd3: embedded-library usr/lib/x86_64-linux-gnu/libgd.so.3.0.0: libgd2