fix(uvm-flowtest): fix deprecated KeysView import in Python

comp/uvm/packet_generators/flowtest/tools/profile_generator.py

@@ -13,7 +13,7 @@
 import random
 from typing import Optional
 from typing import TextIO
-from collections import KeysView
+from collections.abc import KeysView
 from requests.structures import CaseInsensitiveDict