metadata: Mark compatible with GNOME Shell 47

[jbicha]

The extension appears to work for me with GNOME Shell 47 Beta

I did see this in my journal but I don't know if this is a new error:

Gio.DBusError: GDBus.Error:org.freedesktop.DBus.Error.Failed: error occurred in Get

Stack trace:
  _promisify/proto[asyncFunc]/</<@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:453:45
  @resource:///org/gnome/shell/ui/init.js:21:20
  ### Promise created here: ###
  getProperty@file:///usr/share/gnome-shell/extensions/ubuntu-appindicators@ubuntu.com/dbusProxy.js:89:33
  refreshProperty@file:///usr/share/gnome-shell/extensions/ubuntu-appindicators@ubuntu.com/appIndicator.js:306:48
  _refreshOwnProperties/<@file:///usr/share/gnome-shell/extensions/ubuntu-appindicators@ubuntu.com/appIndicator.js:192:32
  _refreshOwnProperties@file:///usr/share/gnome-shell/extensions/ubuntu-appindicators@ubuntu.com/appIndicator.js:190:51
  _onSignalAsync/refreshPropertiesPromises<@file:///usr/share/gnome-shell/extensions/ubuntu-appindicators@ubuntu.com/appIndicator.js:246:26
  _onSignalAsync@file:///usr/share/gnome-shell/extensions/ubuntu-appindicators@ubuntu.com/appIndicator.js:245:50
  async*_onSignal@file:///usr/share/gnome-shell/extensions/ubuntu-appindicators@ubuntu.com/appIndicator.js:204:14
  _init/<@file:///usr/share/gnome-shell/extensions/ubuntu-appindicators@ubuntu.com/dbusProxy.js:40:43
  @resource:///org/gnome/shell/ui/init.js:21:20

Closes: #536

[3v1n0]

Yeah, nothing new I think. What indicator was it?

[jbicha]

Yeah, nothing new I think. What indicator was it?

I believe it was the Mattermost Snap

[emansom]

Ummm, what about the error though