Fix import path to make it vendoring-friendly

Author: jaimergp

src/apipkg/_module.py

@@ -8,10 +8,10 @@
 from typing import cast
 from typing import Iterable
 
+from ._alias_module import AliasModule
 from ._importing import _py_abspath
 from ._importing import importobj
 from ._syncronized import _synchronized
-from apipkg import AliasModule
 
 
 class ApiModule(ModuleType):