Swap get_type to py::type::of (#453)

This fixes a new failure in WarpX CI (see
https://github.com/BLAST-WarpX/warpx/actions/runs/16272157144/job/45942282535?pr=5872)
due to deprecation of `get_type()`.

---------

Signed-off-by: Roelof Groenewald <rgroenewald@tae.com>
Signed-off-by: Axel Huebl <axel.huebl@plasma.ninja>
Co-authored-by: Axel Huebl <axel.huebl@plasma.ninja>

Author: roelof-groenewald

src/Base/MPMD.cpp

@@ -105,7 +105,7 @@ void init_MPMD(py::module &m) {
               // only checks same layout, e.g. an `int` in `PyObject` could
               // pass this
               if (!py::isinstance<py::class_<pyAMReX_PyMPIIntracommObject> >(
-                      app_comm_py.get_type()))
+                      py::type::of(app_comm_py)))
                   // TODO add mpi4py version from above import check to error
                   // message
                   throw std::runtime_error(