[FIX] Calls to deprecated utcnow method of datetime.datetime

datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.now(datetime.UTC).

```python
@classmethod
@deprecated("Use timezone-aware objects to represent datetimes in UTC; e.g. by calling .now(datetime.UTC)")
def utcnow(cls) -> Self
```

allianceauth/authentication/task_statistics/counters.py

@@ -27,7 +27,7 @@ def dashboard_results(hours: int) -> _TaskCounts:
         my_earliest = events.first_event(earliest=earliest)
         return [my_earliest] if my_earliest else []
 
-    earliest = dt.datetime.utcnow() - dt.timedelta(hours=hours)
+    earliest = dt.datetime.now(dt.timezone.utc) - dt.timedelta(hours=hours)
     earliest_events = []
     succeeded_count = succeeded_tasks.count(earliest=earliest)
     earliest_events += earliest_if_exists(succeeded_tasks, earliest)

allianceauth/authentication/task_statistics/event_series.py

@@ -42,7 +42,7 @@ class EventSeries:
         - event_time: timestamp of event. Will use current time if not specified.
         """
         if not event_time:
-            event_time = dt.datetime.utcnow()
+            event_time = dt.datetime.now(dt.timezone.utc)
         my_id = self._redis.incr(self._key_counter)
         self._redis.zadd(self._key_sorted_set, {my_id: event_time.timestamp()})