We used to pin version of setuptools in global-requirements-pins until it got defined in upper-constraints. Since setuptools no longer kept in u-c since Zed, it makes sense to return pinning back. On top of that a major setuptools version was released recently with breaking changes, that affect gnocchi at least [1] [1] https://github.com/gnocchixyz/gnocchi/issues/1304 Change-Id: I5932e8b66bb4674fb1b39442fea467c075b30989
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