Unpin setuptools in dask-gateway-server's build environment

[consideRatio]

I pinned setuptools in the build environment for the dask-gateway-server package to ==63.* as I didn't know another way of resolving the issue.

setuptools in the build environment for dask-gateway-server is now pinned to 63 because 64+ has introduced the "editable_wheel" command to replace the "develop" command, and the editable_wheel command doesn't respect package_data config. We rely on that to get our golang built proxy accessible currently!

Message when using "setuptools>=64" during "pip install --editable .":

Editable install will be performed using a meta path finder.

Options like package-data, include/exclude-package-data or
packages.find.exclude/include may have no effect.

The problematic result is that we end up without a golang binary in dask_gateway_server/proxy/dask-gateway-proxy.

Related

• setuptools 64 changelog
• setuptools warning from the editable_wheel command

[consideRatio]

This is holding back dask-gateway-server working on Python 3.12, because the pinned setuptools is too old to work on Python 3.12 :'(

In #778 we break the editable install in Python 3.12 to make it work.