Test Sphinx 7

[hugovk]

Sphinx 7.0.0 was released on 2023-04-30 and we're now up to 7.2.6.

Let's test it.

However, combined with PR #113, that means we have 6 Python versions x 5 Sphinx versions x 3 operating systems = 90 jobs in the matrix!

I suggest we drop support for Sphinx 4 to bring it down to 6x4x3 = 72 jobs.

Alternatively, we could run the full matrix for Ubuntu, but selectively run a subset of versions for other operating systems. For example, for macOS and Windows, only test the lowest/highest supported Sphinx (4 and 7), and/or Python (3.8 and 3.12).

[Daltz333]

I'm of the opinion we test

• Last 3 sphinx versions
• Last 4 Python versions

[hugovk]

I recommend that what we test == what we support. So support Sphinx 5-7, and Python 3.9-3.12, dropping Sphinx 4 and Python 3.8?

[TheTripleV]

I think it's ok to keep everything in. The only issue would be too many macos runners delaying allwpilib builds but this repo doesn't get daily activity so i don't think it's a big deal.

[Daltz333]

Well, it's also possible support. I agree we shouldn't support what we don't use. And since really this project was made for frc-docs, we should closely align to the update timelines we do there (major dependency/python updates once a year).

I think I agree with @hugovk and it doesn't really hurt us. Users on older Sphinx versions can pin to a lower opengraph version. It's not like we're booming with momentum.