[fib_test] Updated deprecated imports that break in Python 3.10+ (sonic-net#18544)

Update deprecated (in 3.3) import as it breaks in 3.10. Fix is required as Debian Bookworm PTF runs in 3.11.

What is the motivation for this PR?
Preparation to move to Debian Bookworm for docker-ptf

How did you do it?
Modified import

How did you verify/test it?
Locally

Author: opcoder0

ansible/roles/test/files/ptftests/fib_test.py

@@ -39,7 +39,8 @@
 from ptf.testutils import verify_packet_any_port
 from ptf.testutils import verify_no_packet_any
 
-from collections import Iterable, defaultdict
+from collections.abc import Iterable
+from collections import defaultdict
 
 
 class FibTest(BaseTest):

ansible/roles/test/files/ptftests/py3/hash_test.py

@@ -12,7 +12,8 @@
 import six
 import itertools
 
-from collections import Iterable, defaultdict
+from collections.abc import Iterable
+from collections import defaultdict
 from ipaddress import ip_address, ip_network
 
 import ptf