Bump sphinx-rtd-theme from 0.5.1 to 0.5.2 (#859)

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 0.5.1 to 0.5.2.
- [Release notes](https://github.com/readthedocs/sphinx_rtd_theme/releases)
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@0.5.1...0.5.2)

Signed-off-by: dependabot[bot] <support@github.com>

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

Author: cjolowicz

{{cookiecutter.project_name}}/poetry.lock

@@ -47,7 +47,7 @@ pep8-naming = "^0.11.1"
 darglint = "^1.7.0"
 reorder-python-imports = "^2.4.0"
 pre-commit-hooks = "^3.4.0"
-sphinx-rtd-theme = "^0.5.1"
+sphinx-rtd-theme = "^0.5.2"
 sphinx-click = "^2.7.1"
 Pygments = "^2.8.1"