McuSupport: Auto manage memory of McuPackage's version detector

Use smart pointer for member of McuPackage.

Change-Id: I2474fc791b91c489be77aee3aab86401aaef76e8
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Dawid Śliwa <dawid.sliwa@qt.io>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/mcusupport/test/unittest.cpp

@@ -40,6 +40,7 @@
 #include "mcusupportconstants.h"
 #include "mcusupportoptions.h"
 #include "mcusupportsdk.h"
+#include "mcusupportversiondetection.h"
 #include "mcutargetdescription.h"
 #include "mcutargetfactorylegacy.h"