Bump h3 from 1.15.6 to 1.15.11 in /tutorials/verify-backend (#225)

Bumps [h3](https://github.com/h3js/h3) from 1.15.6 to 1.15.11.
- [Release notes](https://github.com/h3js/h3/releases)
- [Changelog](https://github.com/h3js/h3/blob/v1.15.11/CHANGELOG.md)
- [Commits](h3js/h3@v1.15.6...v1.15.11)

---
updated-dependencies:
- dependency-name: h3
  dependency-version: 1.15.11
  dependency-type: indirect
...

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