This change upgrades Sphinx for RBTools to the latest 7.x release and bumps the sphinx-tabs extension to the latest version as well. There are several things that appeared as warnings that I've fixed up: - We were listing `rbtools.commands` twice in the coderef index. - The `source_suffix` setting was changed long ago from a simple string to a dictionary. The older version we were on silently dealt with it, but 7.x warns. - We were triggering a warning about circular references from some changes in autosummary. I've added the recommended workaround, suppressing those warnings. - `configuration/tfs.rst` had an underline that wasn't the length of the header. - Added a few `__autodoc_excludes__` lines to prevent warnings about conflicting references. - The `SquashedDiff` and `DiffHistory` namedtuples were triggering some weird warnings about duplicate fields in the generated docs. Switching to typed NamedTuple classes fixes these. - The inline-link syntax used in docstrings in the SOS code was wrong. - Several doc comments in `config/config.py` were using `:rbt-command:` instead of `:rbtcommand:` Testing Done: Built the RBTools manual and verified that everything worked well.