Desktop: update name for panel-sound

[danirabbit]

Depends on:

• Update for GTK4 panel-sound#335
• Port to GTK4 panel-sound#295

[ryonakano]

Changes LGTM, but let's wait for Launchpad to build and publish the package:

https://code.launchpad.net/~elementary-os/+recipe/wingpanel-indicator-sound-daily

Otherwise merging this does not add the new package name to the metapackages because no such package is available.

[ryonakano]

Launchpad took a long time to build and publish the package but it's available finally. Let's merge this.

user@elementary-9-daily:~$ apt policy io.elementary.panel.sound
io.elementary.panel.sound:
  Installed: (none)
  Candidate: 8.0.3+r898+pkg36~daily~ubuntu9.1
  Version table:
     8.0.3+r898+pkg36~daily~ubuntu9.1 500
        500 https://ppa.launchpadcontent.net/elementary-os/daily/ubuntu resolute/main amd64 Packages
user@elementary-9-daily:~$