Bump html5ever from 0.25.1 to 0.25.2 in /native/html5ever_nif (#56)

Bumps [html5ever](https://github.com/servo/html5ever) from 0.25.1 to 0.25.2.
- [Release notes](https://github.com/servo/html5ever/releases)
- [Commits](https://github.com/servo/html5ever/commits)

---
updated-dependencies:
- dependency-name: html5ever
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]