Update dependency setuptools to v60.0.4

This MR contains the following updates:

Package	Type	Update	Change
setuptools	ironbank-pypi	patch	60.0.3 -> 60.0.4

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Release Notes

pypa/setuptools

v60.0.4

Compare Source

Misc ^^^^

• #​2954: Merge with pypa/distutils@eba2bcd. Adds platsubdir to config vars available for substitution.

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