Re-exporting GFS: 'Mesh' object has no attribute 'calc_normals_split'

[ShrineFox]

Describe the bug
When I import F051_090_0.GFS from P5R and re-export, even without any changes, this exception occurs immediately and export fails.

Traceback (most recent call last):
  File "C:\Users\Ryan\AppData\Roaming\Blender Foundation\Blender\4.2\scripts\addons\BlenderToolsForGFS-develop\src\BlenderIO\modelUtilsTest\Misc\Errorlog\Handler.py", line 10, in handled_execute
    return function(self, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Ryan\AppData\Roaming\Blender Foundation\Blender\4.2\scripts\addons\BlenderToolsForGFS-develop\src\BlenderIO\Export\Operator.py", line 183, in export_file
    bpy_material_names = export_mesh_data(gfs, selected_model, bpy_to_gfs_nodes, full_rest_pose_matrices, errorlog, self.policies)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Ryan\AppData\Roaming\Blender Foundation\Blender\4.2\scripts\addons\BlenderToolsForGFS-develop\src\BlenderIO\Export\ExportModel\Mesh.py", line 54, in export_mesh_data
    gfs_meshes.append(create_mesh(gfs, bpy_mesh_object, armature, node_id, material_names, material_index, version, errorlog, export_policies))
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Ryan\AppData\Roaming\Blender Foundation\Blender\4.2\scripts\addons\BlenderToolsForGFS-develop\src\BlenderIO\Export\ExportModel\Mesh.py", line 241, in create_mesh
    mesh_buffers = extract_vertices(bpy_mesh_object, material_index, bone_names, version, errorlog, export_policies)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Ryan\AppData\Roaming\Blender Foundation\Blender\4.2\scripts\addons\BlenderToolsForGFS-develop\src\BlenderIO\Export\ExportModel\Vertices.py", line 36, in extract_vertices
    bpy_mesh.calc_normals_split()
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'Mesh' object has no attribute 'calc_normals_split'

To Reproduce
Steps to reproduce the behavior:

1. Import F051_090_0.GFS
2. Export as new GMD

Expected behavior
The new GMD should be saved without an exception occurring.

Files
MODEL\FIELD_TEX\F051_090_0.GFS
F051_090_0.zip

Additional context
It appears Mesh.calc_normals_split() has been removed from the Blender Python API after 4.0.