Fix objlen type hint (#2966)

* Fix objlen type hint

* Update redis/commands/json/commands.py

Co-authored-by: dvora-h <67596500+dvora-h@users.noreply.github.com>

* linters

---------

Co-authored-by: dvora-h <67596500+dvora-h@users.noreply.github.com>

Author: trkwyk

redis/commands/json/commands.py

@@ -121,7 +121,9 @@ def objkeys(
         """  # noqa
         return self.execute_command("JSON.OBJKEYS", name, str(path))
 
-    def objlen(self, name: str, path: Optional[str] = Path.root_path()) -> int:
+    def objlen(
+        self, name: str, path: Optional[str] = Path.root_path()
+    ) -> List[Optional[int]]:
         """Return the length of the dictionary JSON value under ``path`` at key
         ``name``.