[gnome-music] (6 commits) Non-fast-forward update to branch wip/mschraal/type-checking

[Marinus Schraal <mschraal src gnome org>]

The branch 'wip/mschraal/type-checking' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  31f67a1... Whitespace fixes
  59b4642... CI: Add static type checking pass
  f29069f... coresong: Add static type annotations
  7ee72f9... grltrackerwrapper: Cleanup timeout handling
  e2e1e21... grltrackerwrapper: Add static type annotations

Commits added to the branch:

  5afebcb... notificationspopup: Fix playlistnotification docstring (*)
  e1619a4... Whitespace fixes
  8975e30... CI: Add static type checking pass
  e42c46e... coresong: Add static type annotations
  4b1e239... grltrackerwrapper: Cleanup timeout handling
  d713932... grltrackerwrapper: Add static type annotations

(*) This commit already existed in another branch; no separate mail sent