Bump readthedocs-sphinx-search from 0.1.1 to 0.3.2 in /doc (#170)

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

doc/requirements.txt

@@ -1,3 +1,3 @@
 sphinx==4.2.0
 sphinx_rtd_theme==1.0.0
-readthedocs-sphinx-search==0.1.1
+readthedocs-sphinx-search==0.3.2