[Python] Avoid include own type (#8625)

This prevents the include of the type defined in the pyi,
otherwise this leads to error message like this:
error: Name XYZ already defined (possibly by an import)  [no-redef]

tests/MyGame/Example/ArrayTable.pyi

@@ -6,7 +6,6 @@ import numpy as np
 import flatbuffers
 import typing
 from MyGame.Example.ArrayStruct import ArrayStruct, ArrayStructT
-from MyGame.Example.ArrayTable import ArrayTable
 
 uoffset: typing.TypeAlias = flatbuffers.number_types.UOffsetTFlags.py_type