fix: build on qt 6.9 (#246)

Author: timschneeb

src/subprojects/AutoEqIntegration/AeqPackageManager.cpp

@@ -133,7 +133,7 @@ QtPromise::QPromise<AeqVersion> AeqPackageManager::getLocalVersion()
     return QtPromise::QPromise<AeqVersion>{[&](
         const QtPromise::QPromiseResolve<AeqVersion>& resolve,
                 const QtPromise::QPromiseReject<AeqVersion>& reject) {
-            QFile versionJson = (databaseDirectory() + "/version.json");
+            QFile versionJson(databaseDirectory() + "/version.json");
             if(!versionJson.exists())
             {
                 reject();
@@ -159,7 +159,7 @@ QtPromise::QPromise<QVector<AeqMeasurement>> AeqPackageManager::getLocalIndex()
     return QtPromise::QPromise<QVector<AeqMeasurement>>{[&](
         const QtPromise::QPromiseResolve<QVector<AeqMeasurement>>& resolve,
                 const QtPromise::QPromiseReject<QVector<AeqMeasurement>>& reject) {
-            QFile indexJson = (databaseDirectory() + "/index.json");
+            QFile indexJson(databaseDirectory() + "/index.json");
             if(!indexJson.exists())
             {
                 reject();