Bump dependency on sphinx-tabs (python#3336)

This latest patch release fixes a RemovedInSphinx90Warning that can be
seen when building the docs without ignoring any warnings via
PYTHONWARNINGS.

I'm working on a few fixes for sphinx-autorun too (see
https://github.com/WhyNotHugo/sphinx-autorun/pulls), one of which
removes some `RuntimeWarning`s. After those come in, we can finally
remove the ignore warning filter we currently use via a `PYTHONWARNINGS`
environment variable in `make do_build`.

Signed-off-by: Rodrigo Tobar <[email protected]>

Author: rtobar

requirements-own.txt

@@ -12,5 +12,5 @@ sphinx-autorun
 sphinxemoji
 sphinx-intl>=2.3.0
 sphinx-lint==0.7.0
-sphinx-tabs==3.4.5
+sphinx-tabs==3.4.7
 tabulate