CI maintenance

[relf]

• Make clippy happy
• Bump MSRV to 1.71.1
• Pin sprs to 1.11.1 version (1.11.2 pulls ndarray 0.16.1 which makes linfa-kernel compilation fail)
• Fix code coverage (?)

[quietlychris]

Looks good to me! The one comment I have is that switching from Vec to &[] can sometimes make things a little less flexible/more finicky, but I guess it make more sense to be consistent. Was that change motivated by clippy lints? Feel free to merge whenever works!

[quietlychris]

Also, it's interesting that sprs = 1.11.2 is breaks things. It's dependency is labeled at ndarray = ">=0.15.0, <0.17", so I understand why ndarray 0.16.1 is an option, but in theory it should just accept linfa's existing ndarray dependency number for 0.15. Definitely having a patch bump shouldn't result in a break per SemVer guidelines.

[relf]

Was that change motivated by clippy lints?

Yes (useless_vec), the change was without sensible side-effect, so...

Also, it's interesting that sprs = 1.11.2 is breaks things [...] Definitely having a patch bump shouldn't result in a break per SemVer guidelines.

I do not understand why ndarray 0.15 is not selected by sprs dependency, either.