Move pinned Qt and Craft cache versions to 6.8.0 and 24.12 respectively

Signed-off-by: Claudio Cambra <claudio.cambra@nextcloud.com>

craftmaster.ini

@@ -27,7 +27,7 @@ ShortPath/EnableJunctions = False
 
 Packager/RepositoryUrl = https://files.kde.org/craft/Qt6
 Packager/PackageType = NullsoftInstallerPackager
-Packager/CacheVersion = 24.08
+Packager/CacheVersion = 24.12
 
 ContinuousIntegration/Enabled = True
 
@@ -42,7 +42,7 @@ Packager/CacheDir = ${Variables:Root}\cache
 [BlueprintSettings]
 nextcloud-client.buildTests = True
 binary/mysql.useMariaDB = False
-libs/qt6.version = 6.7.2
+libs/qt6.version = 6.8.0
 
 [windows-msvc2022_64-cl]
 QtSDK/Compiler = msvc2022_64