Meson: Do not use QFuture implicit conversion

QFuture::operator T() will be removed with Qt 6

Task-number: QTCREATORBUG-24098
Change-Id: Iec7d8d95ab965867e8fa5ddaac496a4129ed08a9
Reviewed-by: Alexis Jeandet <alexis.jeandet@member.fsf.org>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/mesonprojectmanager/project/mesonprojectparser.cpp

@@ -265,7 +265,7 @@ void MesonProjectParser::update(const QFuture<MesonProjectParser::ParserData *>
     }
     addMissingTargets(m_targetsNames);
     m_targetsNames.sort();
-    delete data;
+    delete parserData;
     emit parsingCompleted(true);
 }