Add missing version check for use_auto_smooth

[w1th0utnam3]

Commit 0783423 missed a version check for the use_auto_smooth. This can crash Blender Versions >= 4.1:

AttributeError: 'Mesh' object has no attribute 'use_auto_smooth'
Error in bpy.app.handlers.frame_change_post[0]:
Traceback (most recent call last):
  File "/home/floeschner/.config/blender/4.3/extensions/user_default/sequence_loader/bseq/importer.py", line 355, in update_obj
    update_mesh(meshio_mesh, obj.data)
  File "/home/floeschner/.config/blender/4.3/extensions/user_default/sequence_loader/bseq/importer.py", line 221, in update_mesh
    mesh.use_auto_smooth = True
    ^^^^^^^^^^^^^^^^^^^^
AttributeError: 'Mesh' object has no attribute 'use_auto_smooth'

This PR adds the missing version check.