[gthumb] Created tag 3.12.0

[Paolo Bacchilega <paobac src gnome org>]

The unsigned tag '3.12.0' was created.

Tagger: Paolo Bacchilega <paobac src gnome org>
Date: 1632066597 +0200

    version 3.12.0

Changes since the last tag '3.11.4':

Andika Triwidada (1):
      Update Indonesian translation

AsciiWolf (2):
      Flatpak manifest: improve formatting
      Flatpak manifest: fix the Git repo url

Aurimas Černius (1):
      Updated Lithuanian translation

Balázs Úr (1):
      Update Hungarian translation

Daniel Mustieles (1):
      Updated Spanish translation

J (1):
      Flatpak manifest to create a flatpak for gthumb

Jiri Grönroos (1):
      Update Finnish translation

Jordi Mas (1):
      Update Catalan translation

Jürg Billeter (3):
      webp: unref cairo surface to fix memory leak
      jxl: unref cairo surface to fix memory leak
      avif: unref cairo surface to fix memory leak

Luna Jernberg (1):
      Update Swedish translation

Marek Černocký (1):
      Updated Czech translation

Paolo Bacchilega (8):
      image loader: return error if the image content is null
      Merge branch 'jeteokeeffe/gthumb-master'
      Flatpak manifest: use the master version, added cleanup
      Merge branch 'AsciiWolf-master-patch-23555' into 'master'
      Merge branch 'AsciiWolf-master-patch-20798' into 'master'
      Merge branch 'image-loader-leaks' into 'master'
      check if image is null before using it
      updated for version 3.12.0