chore(topics): fix typing

django_topics/models/topic.py

@@ -1,4 +1,6 @@
 from django.db import models
+from django.db.models.query import QuerySet
+from typing import Any
 import random
 from django_topics.models.pool import TopicPool
 
@@ -14,10 +16,10 @@ def sample_topic_slugs(self, order, pool: str = None, limit=10) -> list[str]:
         else:
             raise Exception("Invalid order: '{}'".format(order))
 
-    def get_pools_by_topic_slug(self, topic_slug: str) -> list[str]:
+    def get_pools_by_topic_slug(self, topic_slug: str) -> QuerySet['Topic', Any]:
         return self.filter(slug=topic_slug).values_list("pools__name", flat=True)
 
-    def get_topic_slugs_by_pool(self, pool: str) -> list[str]:
+    def get_topic_slugs_by_pool(self, pool: str) -> QuerySet['Topic', Any]:
         return self.filter(pools__name=pool).values_list("slug", flat=True)