Bump tendril from 0.4.2 to 0.4.3 in /native/html5ever_nif (#58)

Bumps [tendril](https://github.com/servo/tendril) from 0.4.2 to 0.4.3.
- [Release notes](https://github.com/servo/tendril/releases)
- [Commits](servo/tendril@v0.4.2...v0.4.3)

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

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

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

Author: dependabot[bot]