Bump thiserror from 2.0.11 to 2.0.12 in /native/html5ever_nif

Bumps [thiserror](https://github.com/dtolnay/thiserror) from 2.0.11 to 2.0.12.
- [Release notes](https://github.com/dtolnay/thiserror/releases)
- [Commits](dtolnay/thiserror@2.0.11...2.0.12)

---
updated-dependencies:
- dependency-name: thiserror
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]