test: file regression on every version of python

[bearomorphism]

Description

Checklist

• I have read the contributing guidelines

Code Changes

• Add test cases to all the changes you introduce
• Run poetry all locally to ensure this change passes linter check and tests
• Manually test the changes:
  • Verify the feature/bug fix works as expected in real-world scenarios
  • Test edge cases and error conditions
  • Ensure backward compatibility is maintained
  • Document any manual testing steps performed
• Update the documentation for the changes

Documentation Changes

• Run poetry doc locally to ensure the documentation pages renders correctly
• Check and fix any broken links (internal or external) in the documentation

When running poetry doc, any broken internal documentation links will be reported in the console output like this:

INFO    -  Doc file 'config.md' contains a link 'commands/bump.md#-post_bump_hooks', but the doc 'commands/bump.md' does not contain an anchor '#-post_bump_hooks'.

Expected Behavior

Steps to Test This Pull Request

Additional Context

[bearomorphism]

@noirbizarre

Is there a recommended or simpler way to regenerate all file-regression (golden) test files across all supported Python versions?

I tried using tox, but since I’m not very familiar with it yet, my current attempt tox -- tests/commands/test_common_command.py --regen-all only runs the environments that are already available locally and silently skips the rest.

If the expected workflow requires contributors to install every supported Python version locally in order to regenerate these files, that may become a significant barrier for future contributors.

I'd appreciate guidance on the intended workflow here, or whether regeneration is expected to happen in CI instead.