Use latest natsort package (sonic-net#19962)

- Why I did it
Fix sonic-net#17246

- How to verify it
root@sn2700:/home/admin# docker exec swss pip3 show natsort
Name: natsort
Version: 8.4.0

root@sn2700:/home/admin# pip3 show natsort
Name: natsort
Version: 8.4.0

root@sn2700:/home/admin# docker exec syncd pip3 show natsort
Name: natsort
Version: 8.4.0

src/sonic-py-common/setup.py

@@ -8,7 +8,7 @@
 sonic_dependencies = ['redis-dump-load']
 
 dependencies = [
-    'natsort==6.2.1', # 6.2.1 is the last version which supports Python 2
+    'natsort',
     'pyyaml',
 ]