Bump sphinx-rtd-theme from 1.1.0 to 1.1.1 (#198)

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 1.1.0 to 1.1.1.
- [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@1.1.0...1.1.1)

---
updated-dependencies:
- dependency-name: sphinx-rtd-theme
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -2,4 +2,4 @@ importlib-metadata==5.0.0
 myst-parser==0.18.1
 readthedocs-sphinx-search==0.1.2
 Sphinx==5.3.0
-sphinx-rtd-theme==1.1.0
+sphinx-rtd-theme==1.1.1