fix: 🐛 Fix ValueError when using Flag

[Paillat-dev]

Summary

See also my comment on #2443 .

The issue was that a dataclasses.field object could not be reused and caused unhelpful TypeErrors.

This, or something fixing this issue should ideally be merged before #2443 is merged, and then master merged into #2443 .

Information

• This PR fixes an issue.
  fixes: TypeError when using Flag with python 3.11+ #2758
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed).
• This PR is not a code change (e.g. documentation, README, typehinting,
  examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.
• I have updated the changelog to include these changes.