appstream: updated to 1.0.3

Version 1.0.3

Features:
* validator: Check that description lists don't get translated
* validator: Improve translation checks for descriptions
* cli: compose: Allow to propagate selected custom entries to catalog output
* validator: Check for common typo of "scheme_preference" branding property
* xml: Generate a developer_name compat tag for older 3rd-party parsers
* validator: Flag duplicate branding colors as invalid
* Add Plasma Mobile as recognized desktop-style

Specification:
* docs: Clarify a developer element is not allowed to exist multiple times
* docs: Explicitly clarify a developer/name element must not be repeated
* docs: Clarify metainfo translation rules a bit

Bugfixes:
* qt: Fix relocation of Config.cmake files
* cli: check-syscompat: Recognize available required controls as available
* validator: Guard issue emission functions with G_GNUC_PRINTF
* validator: Always use secure string formatting for issue emit function
* utils: Explicitly set format style when installing catalog metadata
* Suppress static-analyzer drawing wrong conclusions on GCC 14

Miscellaneous:
* docs: List AppStreamCompose as related to AppStream
* docs: Add manpages back
* validator: Mark developer-id-missing as info-priority again

(adam)