Bump doc-building dependencies and switch to image_srcsets support.

Review Request #12856 — Created March 1, 2023 and submitted — Latest diff uploaded

Information

Review Board
release-5.0.x

Reviewers

This bumps our version of Sphinx to 5.3, and our version of
beanbag-docutils to 2.1.1.

Sphinx 5.3 is not the latest version of Sphinx (it's currently at
6.1.3), but it is the latest to support building with Python 3.7.

beanbag-docutils 2.1.1 has fixed support for multi-DPI images, which are
now enabled for our docs (replacing the old Retina image extension).

Successfully installed the new dependencies and built the docs.

Verified that all images with @2x variations now render using
<img srcset> with both 1x and 2x versions.

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