fix for blender 4.x

[dnewcome]

This is a simple update to track the new breaking API changes introduced in Blender 3.4. I'm using Blender 4.3 and this change made the sample py.py script work.

API Change

Blender Version	Old Way	New Way
≤ 3.3	group.outputs.new('NodeSocketGeometry', "Geometry")	❌ (removed)
≥ 3.4	group.interface.new_socket(name="Geometry", in_out='OUTPUT', socket_type='NodeSocketGeometry')	✅ (correct)