Update dependency setuptools to v40.9.0

[renovate]

This PR contains the following updates:

Package	Update	Change	References
setuptools	minor	==40.8.0 -> ==40.9.0	source

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Release Notes

pypa/setuptools

v40.9.0

Compare Source

• #​1675: Added support for setup.cfg-only projects when using the setuptools.build_meta backend. Projects that have enabled PEP 517 no longer need to have a setup.py and can use the purely declarative setup.cfg configuration file instead.
• #​1720: Added support for pkg_resources.parse_requirements-style requirements in setup_requires when setup.py is invoked from the setuptools.build_meta build backend.
• #​1664: Added the path to the PKG-INFO or METADATA file in the exception
  text when the Version: header can't be found.
• #​1705: Removed some placeholder documentation sections referring to deprecated features.

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