Bump sphinx-hoverxref from 1.3.0 to 1.4.0 (#1846)

Bumps [sphinx-hoverxref](https://github.com/readthedocs/sphinx-hoverxref) from 1.3.0 to 1.4.0.
- [Changelog](https://github.com/readthedocs/sphinx-hoverxref/blob/main/CHANGELOG.rst)
- [Commits](readthedocs/sphinx-hoverxref@1.3.0...1.4.0)

---
updated-dependencies:
- dependency-name: sphinx-hoverxref
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]