Bump rcdom/xml5lib-tests from 9a7ca89 to a6d626e (servo#589)

Bumps [rcdom/xml5lib-tests](https://github.com/Ygg01/xml5lib-tests) from `9a7ca89` to `a6d626e`.
- [Commits](Ygg01/xml5lib-tests@9a7ca89...a6d626e)

---
updated-dependencies:
- dependency-name: rcdom/xml5lib-tests
  dependency-type: direct:production
...

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

Author: dependabot[bot]