[Merge] lp:~muktupavels/indicator-sound/indicator-sound into lp:indicator-sound

[Alberts Muktupāvels]

Rebuild requires fix in vala - https://gitlab.gnome.org/GNOME/vala/-/merge_requests/260.
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https://code.launchpad.net/~muktupavels/indicator-sound/indicator-sound/+merge/431274
Your team Indicator Applet Developers is requested to review the proposed merge of lp:~muktupavels/indicator-sound/indicator-sound into lp:indicator-sound.