Bump sphinx-rtd-theme from 1.2.0 to 1.2.1 (#1161)

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 1.2.0 to 1.2.1.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@1.2.0...1.2.1)

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

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

Author: dependabot[bot]

requirements_dev.txt

@@ -14,6 +14,6 @@ recommonmark==0.7.1
 requests==2.28.2
 requests-mock==1.10.0
 sphinx==4.3.2
-sphinx-rtd-theme==1.2.0
+sphinx-rtd-theme==1.2.1
 tqdm==4.65.0
 websocket-client==1.5.2