Remove six and unicode_literals, and require Sphinx 4 or higher.
Review Request #12742 — Created Nov. 28, 2022 and submitted — Latest diff uploaded
We dropped support for Python 2.7 in beanbag-docutils 2.0. As part of a
continued effort to modernize this and prepare for new code, this change
removes the usage and dependency onsix, and removes legacy
unicode_literalsimports.
Unit tests pass.