Python 3.5.10 toolchain build failure: CERTIFICATE_VERIFY_FAILED

[benfrancis]

The python 3.5.10 toolchain (and possibly other python toolchains) is failing to build because it won't accept the latest SSL certificate from https://pypi.python.org

Errors from https://github.com/WebThingsIO/addon-builder/actions/runs/9306232946/job/25615682892 :

149.6 Could not fetch URL https://pypi.python.org/simple/pip/: There was a problem confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:728) - skipping
149.6 Requirement already up-to-date: pip in /usr/local/lib/python3.5/site-packages
149.6 Could not fetch URL https://pypi.python.org/simple/setuptools/: There was a problem confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:728) - skipping
149.6 Requirement already up-to-date: setuptools in /usr/local/lib/python3.5/site-packages
149.7 Collecting wheel
149.9 Could not fetch URL https://pypi.python.org/simple/wheel/: There was a problem confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:728) - skipping
149.9 Could not find a version that satisfies the requirement wheel (from versions: )
149.9 No matching distribution found for wheel

This may be because the version of pip being used doesn't support the type of SSL certificate now being used by that site, see: https://stackoverflow.com/questions/16370583/pip-issue-installing-almost-any-library