build(python): fix `docs` and `docfx` builds (#581) * build(python): fix `docs` and `docfx` builds Source-Link: https://github.com/googleapis/synthtool/commit/fac8444edd5f5526e804c306b766a271772a3e2f Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:5ea6d0ab82c956b50962f91d94e206d3921537ae5fe1549ec5326381d8905cfa * See https://github.com/python/typeshed/issues/11254 * See https://github.com/googleapis/synthtool/pull/1916 --------- Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com> Co-authored-by: Anthonios Partheniou <[email protected]>