update readthedocs-sphinx-search
Needed to address vulnerability https://github.com/readthedocs/readthedocs-sphinx-search/security/advisories/GHSA-xgfm-fjx6-62mj
Needed to address vulnerability https://github.com/readthedocs/readthedocs-sphinx-search/security/advisories/GHSA-xgfm-fjx6-62mj