Revert "Pin version of setuptools"

This reverts commit 3b782d304ec2073a6406c37b9e1a76c8aecfc9a3.

The blockers for setuptools 8 compatibility should all be resolved
now.

Change-Id: I6d2d63746f98f0f885816395f36022a2706fb9c5
Merge "Revert "Pin version of setuptools""