pw_air_poller: fix UTC timezone access

Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: kuba-moo

form-letters/net-next-closed

@@ -1,8 +1,8 @@
-We have already submitted our pull request with net-next material for v6.17,
+We have already submitted our pull request with net-next material for v7.0,
 and therefore net-next is closed for new drivers, features, code refactoring
 and optimizations. We are currently accepting bug fixes only.
 
-Please repost when net-next reopens after Aug 11th.
+Please repost when net-next reopens after Feb 23rd.
 
 RFC patches sent for review only are obviously welcome at any time.
 

pw_air_poller.py

@@ -209,7 +209,7 @@ def get_since_timestamp(self) -> str:
         Returns:
             ISO format timestamp (last check or 3 days ago)
         """
-        three_days_ago = datetime.utcnow() - timedelta(days=3)
+        three_days_ago = datetime.now(UTC).replace(tzinfo=None) - timedelta(days=3)
 
         if self.last_event_ts:
             try: