Add setuptools to requirements.txt

CI Python version is now 3.12. It needs `setuptools`:

From https://docs.python.org/3/whatsnew/3.12.html
> gh-95299: Do not pre-install setuptools in virtual environments created with venv. This means that distutils, setuptools, pkg_resources, and easy_install will no longer available by default; to access these run pip install setuptools in the activated virtual environment
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Dan Halbert 2023-10-28 21:04:38 -04:00 committed by GitHub
parent 34ceca1398
commit a866c9eb1a
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circuitpython-build-tools
setuptools