1 new commit pushed to

<https://github.com/efabless/openlane2/tree/main|main>

by donn

<https://github.com/efabless/openlane2/commit/8a21637641aae2eb9f259e4eb8cde878c5b8ad8b|8a216376>

- Pin Sphinx 7.1 (and other versions) (#144) efabless/openlane2