Update dependency setuptools to v60.9.0

This MR contains the following updates:

Package	Type	Update	Change
setuptools	ironbank-pypi	minor	60.8.2 -> 60.9.0

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Release Notes

pypa/setuptools

v60.9.0

Compare Source

Changes ^^^^^^^

• #​2876: In the build backend, allow single config settings to be supplied.
• #​2993: Removed workaround in distutils hack for get-pip now that pypa/get-pip#​137 is closed.
• #​3085: Setuptools no longer relies on pkg_resources for entry point handling.
• #​3098: Bump vendored packaging to 21.3.
• Removed bootstrap script.

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