Fix the test by installing libbz2-dev

[segasai]

No description provided.

[weaverba137]

I discovered this independently just before the holidays. Within the last few weeks ubuntu-latest went from 22.04 to 24.04, and the latter does not automatically install some of the C libraries needed for fitsio, etc.

[weaverba137]

PS, see desihub/desispec#2429 for a discussion of ubuntu-latest and related issues.

[segasai]

BTW as a person suffering from incompatibility of the desi stack with numpy 2,
I can propose to also add the test of gpu_specter with numpy 2.0.2 (the tests pass)
https://github.com/desihub/gpu_specter/tree/add_numpy2_testing
https://github.com/desihub/gpu_specter/actions/runs/12658192080

[sbailey]

Thanks for fixing this. +1 for adding numpy 2 testing (plus any other fixes needed to support that). Please open another PR when ready (perhaps rebasing that branch off of this newly merged PR if needed to get everything in order).