[revert interim] bump sphinx-tabs from interim fix to 3.3.1

The bugfix of sphinx-tabs issue 152 [1] has been released, we can bump the
version and remove the interim return42/sphinx-tabs.git@fix-152 branch.

[1] https://github.com/executablebooks/sphinx-tabs/issues/152
[2] https://github.com/searxng/searxng/pull/954#issuecomment-1064888261

Closes: https://github.com/searxng/searxng/pull/954


Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>