Revert this part, it only works with DRF 3.15+

rest_framework_nested/relations.py

@@ -6,7 +6,7 @@
 """
 from __future__ import unicode_literals, annotations
 from functools import reduce  # import reduce from functools for compatibility with python 3
-from typing import Any, TypeVar
+from typing import Any, TypeVar, Generic
 
 from django.core.exceptions import ObjectDoesNotExist
 from django.db.models import Model
@@ -18,7 +18,7 @@
 T_Model = TypeVar('T_Model', bound=Model)
 
 
-class NestedHyperlinkedRelatedField(HyperlinkedRelatedField[T_Model]):
+class NestedHyperlinkedRelatedField(HyperlinkedRelatedField, Generic[T_Model]):
     lookup_field = 'pk'
     parent_lookup_kwargs = {
         'parent_pk': 'parent__pk'