Avoid DeprecationWarning "datetime.datetime.utcnow() is deprecated" on
Python >= 3.12, logged once per minute by the master (grains/core.py:2956)
and forwarded to syslog through the OpenRC stderr logger. Both values are
only subtracted from each other, so timezone-aware datetimes are safe.

--- a/salt/grains/core.py
+++ b/salt/grains/core.py
@@ -2953,12 +2953,12 @@ def ip_fqdn():
         if not ret["ipv" + ipv_num]:
             ret[key] = []
         else:
-            start_time = datetime.datetime.utcnow()
+            start_time = datetime.datetime.now(datetime.timezone.utc)
             try:
                 info = socket.getaddrinfo(_fqdn, None, socket_type)
                 ret[key] = list({item[4][0] for item in info})
             except (OSError, UnicodeError):
-                timediff = datetime.datetime.utcnow() - start_time
+                timediff = datetime.datetime.now(datetime.timezone.utc) - start_time
                 if timediff.seconds > 5 and __opts__["__role"] == "master":
                     log.warning(
                         'Unable to find IPv%s record for "%s" causing a %s '