appstream: upgrade 1.0.5 -> 1.0.6

appstream: upgrade 1.0.5 -> 1.0.6

Changelog
=========

Features:
 * compose: Accept .ttc font files
 * compose: Give font icons a background shape
 * compose: Render more elaborate font sample cards

Bugfixes:
 * compose: Insert screenshot tags for auto-generated font screenshots
 * compose: Trim substring when truncating font sample text
 * meson: don't override appstreamcli when cross-building
 * compose: Prefer rendering font icon with "Regular" style
 * compose: Sanitize font text samples before using them as icon
 * Follow directory symlinks when looking for Flatpak data
 * compose: Drop bad private-header include in public header
 * compose: Drop unneeded const declaration for GKeyFile
 * Fix typo that prevented video metadata from being composed properly

Signed-off-by: Markus Kurz <m.kurz92@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>