chore(deps): bump sphinx-rtd-theme from 0.4.2 to 0.4.3 in /docs
chore(deps): bump sphinx-rtd-theme from 0.4.2 to 0.4.3 in /docs

Bumps [sphinx-rtd-theme](https://github.com/rtfd/sphinx_rtd_theme) from 0.4.2 to 0.4.3.
- [Release notes](https://github.com/rtfd/sphinx_rtd_theme/releases)
- [Changelog](https://github.com/rtfd/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](https://github.com/rtfd/sphinx_rtd_theme/compare/0.4.2...0.4.3)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
apiaryio/dredd,apiaryio/dredd,apiaryio/dredd