scipy: make test tasks depend on build tasks

[lucascolley]

this ensures that, if one runs a test task before running the build task, the build is performed with the desired flags and env.

If a dev wants to perform a custom build before running a test task, they can run the test task with --skip-deps.

[rgommers]

Thanks Lucas. There was a reason why I didn't put this in earlier, and I can no longer remember the details - it had something to do with dependencies not being consistent across environments, or having to build in the default environment rather than the active non-default one.

I don't know if those reasons are still relevant. I'll try testing this.

[rgommers]

Is the multi-line syntax preferred? That one cannot line break the { } syntax is annoying, but I'm not sure the separate lines read better overall.

[lucascolley]

Is the multi-line syntax preferred? That one cannot line break the { } syntax is annoying

preferred for me! Mainly because one cannot line break the { }.

[stefanv]

Multi-line syntax should be available in TOML 1.1, scheduled for April 2024 🙃

toml-lang/toml#928
toml-lang/toml#928