When building today's python-pytest-doc openSUSE package
in the year 2033, the documentation .html files state
Copyright 2015-2033 , holger krekel and pytest-dev team.
That cannot be correct, because nobody did anything copyright-worthy
for this file in 2033.
See also https://stackoverflow.com/questions/2390230/do-copyright-dates-need-to-be-updated
Additionally, this change makes the package build reproducible.
See https://reproducible-builds.org/ for why this is good.
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