Fix qHash-related size compatibility warnings by MSVC

Change-Id: I3b7981ce78b67db4b996f99682284a0b911d8cd7
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/texteditor/codeassist/genericproposalmodel.cpp

@@ -41,7 +41,7 @@
 using namespace TextEditor;
 
 QT_BEGIN_NAMESPACE
-uint qHash(const AssistProposalItem &item)
+auto qHash(const AssistProposalItem &item)
 {
     return qHash(item.text());
 }