setup-python CI workflows have been broken for more than 2 months #891

Description:
setup-python CI workflows have been broken for more than 2 months.
This does not help to report / triage new bug reports.
Many issues should have been detected by setup-python own workflows but those are broken.

Action version:
main

Platform:

• Ubuntu
• macOS
• Windows

Runner type:

• Hosted
• Self-hosted

Tools version:
multiple

Repro steps:
See the main branch status: https://github.com/actions/setup-python/actions?query=branch%3Amain

Expected behavior:
All CI workflows are green.

Actual behavior:
They've been failing for 2 months.