fix: Rename sortBy parameters option (#426)

Renamed option for sortBy parameter from "lastRunStartedAt" to
"stats.lastRunStartedAt" to fit the
[TICKET](https://app.zenhub.com/workspaces/platform-team-5f6454160d9f82000fa6733f/issues/gh/apify/apify-core/20997)
specifications. Will merge when the [apify-core
PR](apify/apify-core#21731) is deployed

Author: protoss70

src/apify_client/clients/resource_clients/actor_collection.py

@@ -26,7 +26,7 @@ def list(
         limit: int | None = None,
         offset: int | None = None,
         desc: bool | None = None,
-        sort_by: Literal['createdAt', 'lastRunStartedAt'] | None = 'createdAt',
+        sort_by: Literal['createdAt', 'stats.lastRunStartedAt'] | None = 'createdAt',
     ) -> ListPage[dict]:
         """List the Actors the user has created or used.
 
@@ -152,7 +152,7 @@ async def list(
         limit: int | None = None,
         offset: int | None = None,
         desc: bool | None = None,
-        sort_by: Literal['createdAt', 'lastRunStartedAt'] | None = 'createdAt',
+        sort_by: Literal['createdAt', 'stats.lastRunStartedAt'] | None = 'createdAt',
     ) -> ListPage[dict]:
         """List the Actors the user has created or used.