Log Message:
py-xml2rfc: updated to 3.17.4

v3.17.4 - 2023-06-22

🐛 Bug Fixes

- Remove old tools server from BibXML lookup locations
- Switch from appdirs to platformdirs, since it is maintained
- Warn when reference uses PIs
- Reset seen_slugs cache on every prep run
- Add xml extension to BibXML requests