tests: fix catch2 3 support

[henryiii]

Is there an easy way to pre-install this in CI or download it (perhaps in meson)? It's bad that we aren't running in CI with version 3 (but don't want to drop 2, since we can't drop it until we drop C++11).

[phlptp]

Definitely don't want to do that this Release, but at what point do we consider upping the minimum compiler support to C++14?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ef327b7) 100.00% compared to head (ee53a1d) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #980   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files           18        18           
  Lines         4573      4573           
=========================================
  Hits          4573      4573           

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[henryiii]

That's tricky, since "11" is in our name. :) I suppose it needs to be done at some point, though. Don't have a strong opinion, 14+ won't actually affect us too much, 17+ would be larger. 14+ would actually affect pybind11 more (which also has 11 in the name, and also hasn't increased it yet...)

[henryiii]

If we could go 23+ I'd use std::result instead of exception handling. :)

[phlptp]

Most of my other code is running C++17 as min now, Might move some to C++20, this summer after Ubuntu 24.04 comes out. Not going to be able to move to 23, likely until at least late '26

[henryiii]

Okay, maybe we can target moving to 17+ this year. Might see what pybind11 does, too, we could match that (even though they are completely unrelated, but it's simpler if the projects I maintain are similar ;) )