Update alsa to 0.11

[Sin-tel]

Upcoming version 0.18 of cpal conflicts with lower alsa-sys versions.

I didn't really do anything except bump the version, but the previous code specifically had alsa = ">=0.9.0, <0.11", so maybe I'm missing something?

(Also some minor fixes in unrelated code to make CI pass.)

[Boddlnagg]

Thanks for the PR!
The reason for >=0.9.0, <0.11 was that 0.11 didn't exist yet and we needed some way to specify that it's compatible with both 0.9 and 0.10, because it's helpful to be compatible to a wider range of versions.
Is the new code (after this change) no longer compatible with 0.9 or 0.10?

[Sin-tel]

Nothing's changed really so things should just work. The changes are actually unrelated, likely because of updates in rustc.

Can change it to >=0.9.0, <0.12 if you think that's better.

Full disclosure: I'm on Windows so I'm just relying on CI to to catch issues.

[Boddlnagg]

Yes, I would prefer >=0.9.0, <0.12 if no changes in between are affecting us.