audio/spotify-qt: update to 3.6

Fixes:
-Fixed not loading all saved albums (#59).
-Fixed "Like" in track context menu not updating properly (#75).
-Fixed build on Qt 5.9 and older (#76).
-Fixed a crash when playing from artist (#83).
-Fixed a crash when the current user had no profile image (#86).
-Fixed not showing any error message when no devices were available.
-Fixed not loading all artist albums.
-Fixed deprecation warnings when using Qt 6.
-Fixed showing "What's new" on first start.
-Fixed playing a new track with the same name, not updating currently playing.
-Fixed not selecting last used device when resuming playback after being idle.
-Fixed style option not setting default style.

Changes:
-Progress bar can now be clicked to skip in the track (#62).
-Added support for multiple artists (#67).
-Now remembers your last used device and selects it on next start (#73).
-Improved theming in snap (#79).
-Added a desktop icon for snap (#80).
-All networking is now done asynchronously, which should improve performance.
-Spotify client can now be started and/or stopped from Spotify settings.
-Windows builds are now available (see #95).

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