chore: fix some codeql warnings

Signed-off-by: Trial97 <alexandru.tripon97@gmail.com>

launcher/ui/pages/modplatform/technic/TechnicData.h

@@ -36,6 +36,7 @@
 #pragma once
 
 #include <QList>
+#include <QMetaType>
 #include <QString>
 
 namespace Technic {

launcher/ui/pages/modplatform/technic/TechnicPage.cpp

@@ -135,7 +135,9 @@ void TechnicPage::onSelectionChanged(QModelIndex first, [[maybe_unused]] QModelI
         return;
     }
 
-    current = model->data(first, Qt::UserRole).value<Technic::Modpack>();
+    QVariant raw = model->data(first, Qt::UserRole);
+    Q_ASSERT(raw.canConvert<Technic::Modpack>());
+    current = raw.value<Technic::Modpack>();
     suggestCurrent();
 }