ClangFormat: Fix compilation with Qt 6.2.4

Change-Id: I71f28a258ad9f3b2e745c409edb6d2fe1a5bfea3
Reviewed-by: Artem Sokolovskii <artem.sokolovskii@qt.io>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/clangformat/clangformatbaseindenter.h

@@ -79,7 +79,7 @@ private:
         void setCache(clang::format::FormatStyle newStyle, std::chrono::milliseconds timeout)
         {
             style = newStyle;
-            expirationTime = QDateTime::currentDateTime() + timeout;
+            expirationTime = QDateTime::currentDateTime().addMSecs(timeout.count());
         }
     };