AutoTest: Fix missing includes

Change-Id: Ieb34092c8c78068ae1630cfaa0f18a45f7d43c0c
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

src/plugins/autotest/qtest/qttestparser.cpp

@@ -10,6 +10,7 @@
 #include <cplusplus/TypeOfExpression.h>
 #include <utils/algorithm.h>
 
+#include <QPromise>
 #include <QRegularExpressionMatchIterator>
 
 using namespace Utils;