Bump sphinxcontrib-httpdomain from 1.8.0 to 1.8.1
    
    Bumps [sphinxcontrib-httpdomain](https://github.com/sphinx-contrib/httpdomain) from 1.8.0 to 1.8.1.
    - [Release notes](https://github.com/sphinx-contrib/httpdomain/releases)
    - [Changelog](https://github.com/sphinx-contrib/httpdomain/blob/main/doc/changelog.rst)
    - [Commits](https://github.com/sphinx-contrib/httpdomain/compare/1.8.0...1.8.1)
    
    ---
    updated-dependencies:
    - dependency-name: sphinxcontrib-httpdomain
      dependency-type: direct:production
      update-type: version-update:semver-patch
    ...
    
    Signed-off-by: dependabot[bot] <support@github.com>