fix: allow libsqlite3-sys >=0.28

[Caleb Hattingh (cjrh)]

Summary

First diagnosed in microsoft/duroxide-pg#4. The root issue is that `libsqlite3-sys was clamped to 0.28 but sqlx==0.8.6 requires libsqlite3-sys >= 0.30.

Checklist

• Tests added/updated
• cargo test passes locally
• Docs updated
  • Existing docs updated where behavior changed
  • New doc added under docs/ if introducing a new area
  • Linked from docs/README.md

[Affan Dar (affandar)]

thanks, merged.