Please provide support for docutils 0.18.x

[befeleme]

Context

It's been some time for docutils 0.18.x out there and it finally gained the support of Sphinx 5 & MyST-Parser. As we want to integrate newer documentation stack in Fedora, it would be great if sphinx-tabs supported it as well.

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[foster999]

Now supported from v3.4.1 😄