Bump readthedocs-sphinx-search from 0.1.1 to 0.3.2 in /docs

Bumps [readthedocs-sphinx-search](https://github.com/readthedocs/readthedocs-sphinx-search) from 0.1.1 to 0.3.2.
- [Changelog](https://github.com/readthedocs/readthedocs-sphinx-search/blob/main/CHANGELOG.rst)
- [Commits](readthedocs/readthedocs-sphinx-search@0.1.1...0.3.2)

---
updated-dependencies:
- dependency-name: readthedocs-sphinx-search
  dependency-type: direct:production
...

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

docs/requirements.txt

@@ -4,7 +4,7 @@ numpydoc
 ipython
 pandas
 pysat
-readthedocs-sphinx-search==0.1.1
+readthedocs-sphinx-search==0.3.2
 scipy
 sphinx_rtd_theme==1.0.0
 sphinx==4.2.0