[libsecret] (5 commits) Non-fast-forward update to branch wip/dueno/backend

[Daiki Ueno <dueno src gnome org>]

The branch 'wip/dueno/backend' 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:

  480966b... secret-backend: New interface to represent password storage
  3483699... secret-service: Implement SecretBackendInterface
  aecc88c... secret-backend: Add instantiation logic [ci skip]

Commits added to the branch:

  9a6452d... secret-backend: New interface to represent password storage
  0f666d2... secret-service: Implement SecretBackendInterface
  deb5de1... secret-service: Move instance caching logic to init vfunc
  71f0acb... secret-backend: Add a way to uncache singleton instance
  e8ecced... secret-password: Port to SecretBackend interface [ci skip]