test: replace Callable/Iterable with their collections.abc alternative (PEP 585)

test/functional/test_framework/util.py

@@ -20,7 +20,8 @@ import time
 
 from . import coverage
 from .authproxy import AuthServiceProxy, JSONRPCException
-from typing import Callable, Optional
+from collections.abc import Callable
+from typing import Optional
 
 logger = logging.getLogger("TestFramework.utils")