Bump webpki from 0.21.4 to 0.22.4 in /crates/robbb_db

Bumps [webpki](https://github.com/briansmith/webpki) from 0.21.4 to 0.22.4.
- [Commits](https://github.com/briansmith/webpki/commits)

---
updated-dependencies:
- dependency-name: webpki
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>