ristretto: upgrade 0.12.1 -> 0.12.2

Release notes for 0.12.2
========================
- New Features:
  - Thumbnailer: Add support for shared thumbnail repositories (#82)
  - Thumbnailer: Add thumbnail flavor support (#81)
- Performance Improvement:
  - Optimization: Use TreeModel IFace to walk the image list
  - Optimization: Add index and list link to RsttoImageListIter
  - Optimization: Switch to GQueue in RsttoImageList
- Code Refactoring:
  - Flatpak: Add lifecycle manager patch to Xfconf dependency
  - Flatpak: Add Tumbler dependency as a private service (!35)
  - Flatpak: Add pixbuf loaders
  - Refactoring: Cleanup and simplifications around thumbnail size
  - Redistribute thumbnail sizes uniformly
  - Disable debug checks in release mode
  - Cleanup: Miscellaneous
  - Cleanup: Remove unused APIs in RsttoImageList
- Bug Fixes:
  - Fix and complete file change monitoring
  - Thumbnailer: Rework queue management
  - Thumbnailer: Properly set the number of visible items
  - Take the device scale into account to limit rendering quality
  - Avoid multi-threading issue with X11 (#76)
- Translation Updates

Signed-off-by: Andreas Müller <schnitzeltony@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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