Port from qAsConst() to std::as_const()

We've been requiring C++17 since Qt 6.0, and our qAsConst use finally
starts to bother us (QTBUG-99313), so time to port away from it
now.

Since qAsConst has exactly the same semantics as std::as_const (down
to rvalue treatment, constexpr'ness and noexcept'ness), there's really
nothing more to it than a global search-and-replace.

Task-number: QTBUG-99313
Change-Id: I88edd91395849574436299b8badda21bb93bea39
Reviewed-by: hjk <hjk@qt.io>

src/plugins/mcusupport/mcusupportoptions.cpp

@@ -100,7 +100,7 @@ void McuSupportOptions::setQulDir(const FilePath &)
         sdkRepository = targetsAndPackages(qtForMCUsSdkPackage, settingsHandler);
     else
         sdkRepository = McuSdkRepository{};
-    for (const auto &package : qAsConst(sdkRepository.packages))
+    for (const auto &package : std::as_const(sdkRepository.packages))
         connect(package.get(),
                 &McuAbstractPackage::changed,
                 this,