Announce: libportal 0.6

[Phaedrus Leeds]

Available here:
  https://github.com/flatpak/libportal/releases/tag/0.6

$ sha256sum libportal-0.6.tar.xz
88a12c3ba71bc31acff7238c280de697d609cebc50830c3766776ec35abc6566  libportal-0.6.tar.xz

- New portal support: Dynamic launcher
- Add API for checking for flatpak/snap sandbox
- Fix a bug where the callback setup by libportal for a GCancellable was not
  properly canceled in case a portal method call was not successful, which can
  lead to a double free seg fault
- libportal-qt: Add convenient functions to better deal with GVariants
- libportal-qt: Use a global instance of XdpPortal object
- libportal-qt: make filechooserFilterToGVariant() public
- camera: Use correct variant for is_camera_present()
- portal-test-gtk3: Fix incorrect paths used in tests
- Documentation improvements
- CI improvements

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Phaedrus Leeds