root: switch from drf-yasg to drf_yasg2 and up rest_framework

passbook/api/v2/messages.py

@@ -1,6 +1,6 @@
 """core messages API"""
 from django.contrib.messages import get_messages
-from drf_yasg.utils import swagger_auto_schema
+from drf_yasg2.utils import swagger_auto_schema
 from rest_framework.permissions import AllowAny
 from rest_framework.request import Request
 from rest_framework.response import Response

passbook/api/v2/urls.py

@@ -1,7 +1,7 @@
 """api v2 urls"""
 from django.urls import path, re_path
-from drf_yasg import openapi
-from drf_yasg.views import get_schema_view
+from drf_yasg2 import openapi
+from drf_yasg2.views import get_schema_view
 from rest_framework import routers
 from rest_framework.permissions import AllowAny