Adapt to KService::property API change

src/utils/serviceutils.h

@@ -43,7 +43,7 @@ static QStringList fetchProcessServiceField(const QString &executablePath, const
         return {};
     }
 
-    const auto fieldValues = servicesFound.first()->property(fieldName).toStringList();
+    const auto fieldValues = servicesFound.first()->property<QStringList>(fieldName);
     if (KWIN_UTILS().isDebugEnabled()) {
         qCDebug(KWIN_UTILS) << "Interfaces found for" << executablePath << fieldName << ":" << fieldValues;
     }

src/xdgactivationv1.cpp

@@ -40,7 +40,7 @@ static const QString windowDesktopFileName(Window *window)
     // Fallback to StartupWMClass for legacy apps
     const auto resourceName = window->resourceName();
     const auto service = KApplicationTrader::query([&resourceName](const KService::Ptr &service) {
-        return service->property("StartupWMClass").toString().compare(resourceName, Qt::CaseInsensitive) == 0;
+        return service->property<QString>("StartupWMClass").compare(resourceName, Qt::CaseInsensitive) == 0;
     });
 
     if (!service.isEmpty()) {