Remove use of typing.Set

Replace all use of typing.Set with its equivalent Python collection,
set. This syntax was introduced by Python 3.9 as part of PEP 585.

See https://peps.python.org/pep-0585/

Change-Id: I9f70352f6b2f8f4cb21519149c04c82c1d04ad80
Reviewed-on: https://fuchsia-review.googlesource.com/c/antlion/+/890276
Fuchsia-Auto-Submit: Sam Balana <sbalana@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
Reviewed-by: Karl Ward <karlward@google.com>
diff --git a/packages/antlion/controllers/access_point.py b/packages/antlion/controllers/access_point.py
index c32901f..28477a3 100755
--- a/packages/antlion/controllers/access_point.py
+++ b/packages/antlion/controllers/access_point.py
@@ -17,7 +17,7 @@
 import ipaddress
 import time
 from dataclasses import dataclass
-from typing import Any, FrozenSet, Mapping, Set
+from typing import Any, FrozenSet, Mapping
 
 from antlion import logger, utils
 from antlion.capabilities.ssh import SSHConfig, SSHProvider
@@ -711,7 +711,7 @@
             raise ValueError(f"Invalid identifier {identifier} given")
         return instance.hostapd.get_current_channel()
 
-    def get_stas(self, identifier: str) -> Set[str]:
+    def get_stas(self, identifier: str) -> set[str]:
         """Return MAC addresses of all associated STAs on the given AP."""
         instance = self._aps.get(identifier)
         if instance is None:
diff --git a/packages/antlion/controllers/ap_lib/hostapd.py b/packages/antlion/controllers/ap_lib/hostapd.py
index 6e355f2..75de9e6 100644
--- a/packages/antlion/controllers/ap_lib/hostapd.py
+++ b/packages/antlion/controllers/ap_lib/hostapd.py
@@ -17,7 +17,7 @@
 import logging
 import re
 import time
-from typing import Any, Iterable, Set
+from typing import Any, Iterable
 
 from antlion.controllers.ap_lib import hostapd_constants
 from antlion.controllers.ap_lib.extended_capabilities import ExtendedCapabilities
@@ -157,7 +157,7 @@
         list_sta_cmd = "list_sta"
         return self._run_hostapd_cli_cmd(list_sta_cmd)
 
-    def get_stas(self) -> Set[str]:
+    def get_stas(self) -> set[str]:
         """Return MAC addresses of all associated STAs."""
         list_sta_result = self._list_sta()
         stas = set()