Use using declarations instead of typedef

PR #19458.

src/base/bittorrent/speedmonitor.h

@@ -64,8 +64,8 @@ struct Sample
     T upload {};
 };
 
-typedef Sample<qlonglong> SpeedSample;
-typedef Sample<qreal> SpeedSampleAvg;
+using SpeedSample = Sample<qlonglong>;
+using SpeedSampleAvg = Sample<qreal>;
 
 class SpeedMonitor
 {

src/base/types.h

@@ -40,4 +40,4 @@ enum class ShutdownDialogAction
     Hibernate
 };
 
-typedef QMap<QString, QString> QStringMap;
+using QStringMap = QMap<QString, QString>;