Unpin sphinx 7.2

[JoeZiminski]

This PR unpins sphinx, closes #397 that describes the issue.

Tested locally and it builds OK, docs look good. No tests or further documentation required. However, in the new style, the dropdown menus all have a thick green border around them. I will probably turn this off unless @neuroinformatics-unit/neuroinformatics-all particularly likes them (for me it makes the pages look too busy):

[niksirbi]

I kinda see why they introduced the green borders. Previously, it was not super clear to see where the content of a tab/dropdown ended and the "normal" content began. There was a faint horizontal line in between, but at a glance it was not easy to see what belongs to the tab and what not. So I'd be in favour of keeping them despite the visual "clutter" they add, but I don't feel too strongly about this.

[niksirbi]

The public datashuttle.neuroinformatics.dev already has the green borders btw and imo it looks ok. I think this is due to a Pydata Sphinx Theme update, not related to the pinned Sphinx version per se.

[niksirbi]

Unrelated to this PR, but do we still need the sphinx-argparse plugin since we dropped the CLI docs?

[lochhh]

I kinda see why they introduced the green borders. Previously, it was not super clear to see where the content of a tab/dropdown ended and the "normal" content began. There was a faint horizontal line in between, but at a glance it was not easy to see what belongs to the tab and what not. So I'd be in favour of keeping them despite the visual "clutter" they add, but I don't feel too strongly about this.

The reason is for accessibility.

[niksirbi]

Good to know they are taking such a considered and systematic approach to design! I'm glad we have hopped on the pydata-sphinx-theme bandwagon.

[JoeZiminski]

Nice! Thanks both lets keep them good spot @lochhh. Oh yes indeed sphinx-argparse is no longer required, will make a quick follow-up PR cheers.