Make `get_nested_resource_ptr` support a nested sequence of bytes

[leofang]

Copilot picked up one thing that is interesting.

cuda-python/cuda_bindings/cuda/bindings/_internal/utils.pyx

Lines 100 to 101 in 4886636

	if ResT is char:
	obj_i_bytes = (<str?>(obj_i)).encode()

Here, this block handles a nested sequence and the expectation is that the inner objects obj_i are strings. But, in such cases it makes sense to also accept bytes, something like

obj_i_type = type(obj_i)
if obj_i_type is str:
    obj_i_bytes = obj_i.encode()
else:
    assert obj_i_type is bytes
    obj_i_bytes = obj_i

[rparolin]

#1665