icetray - suppress dodgy gcc warning (#3551)

GCC has a new-ish warning `-Wdangling-reference` that's part of `-Wall`.
While good in concept, it seems to suffer from too many false-positives.
This commit suppresses the warning here for all versions of GCC < 14.2.
Hopefully by then the false positives rate will have been addressed or
the warning is removed from `-Wall`.

icetray/public/icetray/python/boost_serializable_pickle_suite.hpp

@@ -77,7 +77,19 @@ struct boost_serializable_pickle_suite : boost::python::pickle_suite
 {
     static boost::python::tuple getstate(boost::python::object element_obj)
     {
+
+// as of gcc 14.1 -Wdangling-reference (included in -Wall) is still being
+// ironed out. kick that can down the road.
+#if __GNUC__ == 13 || \
+        (__GNUC__ == 14 && __GNUC_MINOR__ < 2)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdangling-reference"
+#endif
         const T &element = boost::python::extract<const T &>(element_obj)();
+#if __GNUC__ == 13 || \
+        (__GNUC__ == 14 && __GNUC_MINOR__ < 2)
+#pragma GCC diagnostic pop
+#endif
 
         // serialize the object into a buffer
         std::vector<char> blobBuffer;