Replace deprecated datetime.utcnow()

The datetime.utcnow() is deprecated in Python 3.12.
Replace datetime.utcnow() with
datetime.now(datetime.timezone.utc).replace(tzinfo=None).

Change-Id: I9bf6f69d9e174d490bb4f3eaef3b364ddf97a954
Signed-off-by: Takashi Natsume <takanattie@gmail.com>
1 file changed