copyright = u'2016 - %s, Caleb Bell <Caleb.Andrew.Bell@gmail.com>' %datetime.datetime.now().year
.
That line says "2016 - %s" and the build outputs (as of today) are "2022 - 2022" and "2022 - 2023".
The difference between 2022 and 2023 is because the second build runs in the future.
The difference between 2016 (in the source file) and 2022 (in the LHS of both builds' outputs) was reproduced in a plain `dpkg-buildpackage` build in a fresh sid chroot. It doesn't affect reproducibility.