spotify-player: update to 0.21.2.

[non-Jedi]

Ping maintainer @mdkcore0. Closes #56927.

Testing the changes

• I tested the changes in this PR: briefly

Unable to authenticate due to aome510/spotify-player#898, so I was not able to test all functionality.

Local build testing

• I built this PR locally for my native architecture, x86_64-glibc
• I built this PR locally for these architectures (if supported. mark crossbuilds):
  • armv6l (cross) (as suggested by Contributing.md; hadn't done this before, but it went without a hitch)

[classabbyamp]

Unable to authenticate due to aome510/spotify-player#898, so I was not able to test all functionality.

is this an issue with the old version too?

[non-Jedi]

As far as I can tell the version currently in the repo doesn't work for authentication due to aome510/spotify-player#802. I updated hoping to get it working.