[gnome-boxes] (6 commits) Non-fast-forward update to branch wip/run-in-bg

[Felipe Borges <felipeborges src gnome org>]

The branch 'wip/run-in-bg' 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:

  c04428e... app: Keep GApplication alive when running in background
  33b1dd1... Rename all singleton access methods to "get_default ()"
  6e11344... portals: Add singleton to talk to xdg-desktop-portals
  68ba936... libvirt-machine-properties: Verify that our Flatpak is auth
  6a64cef... libvirt-machine-properties: No need to talk to Portals when
  67182c0... ci: Build against Fedora 33

Commits added to the branch:

  76f63b3... app: Keep GApplication alive when running in background
  c16e329... Rename all singleton access methods to "get_default ()"
  12ab0dc... portals: Add singleton to talk to xdg-desktop-portals
  cca6e48... libvirt-machine-properties: Verify that our Flatpak is auth
  772643b... libvirt-machine-properties: No need to talk to Portals when
  546aba6... ci: Build against Fedora 33