Update sphinx_rtd_theme to 0.4.3

[pyup-bot]

This PR updates sphinx_rtd_theme from 0.4.2 to 0.4.3.

The bot wasn't able to find a changelog for this release. Got an idea?

Links

• PyPI: https://pypi.org/project/sphinx-rtd-theme
• Repo: https://github.com/rtfd/sphinx_rtd_theme/

[codecov]

Codecov Report

Merging #574 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #574   +/-   ##
=======================================
  Coverage   95.64%   95.64%           
=======================================
  Files          55       55           
  Lines        2850     2850           
=======================================
  Hits         2726     2726           
  Misses        124      124

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