Replace use of py::object copy constructor with use of move constructor

Change explicit constructor of benchmark_wrapper_t to use move-constructor
of py::object instead of copy constructor by replacing `py::object(o)` with
`py::object(std::move(o))`.

Author: oleksandr-pavlyk

python/src/py_nvbench.cpp

@@ -76,7 +76,7 @@ struct benchmark_wrapper_t
   benchmark_wrapper_t() = default;
 
   explicit benchmark_wrapper_t(py::object o)
-      : m_fn{std::shared_ptr<py::object>(new py::object(o), PyObjectDeleter{})}
+      : m_fn{std::shared_ptr<py::object>(new py::object(std::move(o)), PyObjectDeleter{})}
   {
     if (!PyCallable_Check(m_fn->ptr()))
     {