Update to 3.12.1

Bugfixes:

• PNG loader ignores gAMA. (#194)
• Transparent webp images are rendered incorrectly. (#199)
• Crash when dropping files on an empty folder/catalog. (#220)
• Fixed location loading after mounting volume.
• JPEG image dimensions not displayed for files inside the trash. (#214)
• Infinite Loop when viewing more than 50 thumbnails. (Kendy Kutzner)
• X11 window title is not set. (Bruno Vasselle)
• Copy release notes on build from NEWS to metainfo file. (Federico Bruni)
• Fixed build if appstream >= 0.14.6 is not available.
• Fix incorrect usage of shared_module in extensions. (Jakub Jirutka)
• cli: mention that user can open files and/or directories. (#167)

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