- Poetry build sdist timestamps set to epoch 0
Newer versions of poetry set the timestamp for all source
files to epoch 0. Such sources are not accepted by e.g
Debian FTP servers and in general I don't like when tools
changes their behavior just like that. This commit forces
an older version of poetry for the purpose of creating the
sdist tarball which then gets published on pypi. The
argumentation for reproducible builds by forcing source
files to a certain timestamp doesn't fly for me. I'm open
for any better solution though. This Fixes#2730
OBS-URL: https://build.opensuse.org/package/show/Virtualization:Appliances:Builder/python-kiwi?expand=0&rev=281
