Changes:
- Update frequency: weekly → daily (06:00 UTC)
- Add retry with exponential backoff (3 attempts per source)
- Add multiple source endpoints (sw.js + bootstrap page)
- Add version validation (sanity checks on revision numbers)
- Add fetch timeout to prevent hanging
- Add detailed logging for debugging
- Simplify workflow to only update baileys-version.json
This makes the version update more reliable and responsive
to WhatsApp Web changes.