[MU4 Issue] appstream file out of date

[hfiguiere]

Describe the bug The appstream file in build/Linux+BSD/org.musescore.MuseScore.appdata.xml.in is out of date. The last release it lists in 3.3.4. Not even 3.6.2

To Reproduce

n/a

Expected behavior

Expect to have the proper version

Screenshots

n/a

Platform information

• OS: Linux. But literally n/a

Additional context

This mean that the information will be wrong in GNOME Software or whatever equivalent in a Desktop Environment.

This should be updated at release time or something.