setup: avoid setuptools 67 - it can't handle celery's broken pytz dependency With setuptools 67 or later, launching Kallithea fails as: $ gearbox serve -c my.ini --reload 15:56:54,111 ERROR [gearbox] Expected closing RIGHT_PARENTHESIS pytz (>dev) ~^ The `packaging` vendored in setuptools cannot handle the broken syntax `Requires-Dist: pytz (>dev)` in venv/lib/python3.11/site-packages/celery-5.0.5.dist-info/METADATA . The old celery version currently used by Kallithea is wrong, and setuptools has moved on after a reasonable grace period. We thus have to work around and avoid latest setuptools. See https://github.com/pypa/setuptools/issues/3889 .