feat(desktop/craft/linux): build 6.9.3 Qt release

Signed-off-by: Matthieu Gallien <matthieu.gallien@nextcloud.com>

Author: mgallien

client-appimage-qt6/craftmaster.ini

@@ -38,7 +38,7 @@ Packager/CacheDir = ${Variables:Root}\cache
 [BlueprintSettings]
 nextcloud-client.buildTests = True
 binary/mysql.useMariaDB = False
-libs/qt6.version = 6.10.1
+libs/qt6.version = 6.9.3
 craft/craft-blueprints-kde.revision = stable-4.0
 
 [windows-msvc2022_64-cl]