uptime: replace use of deprecated datetime.utcnow()

sopel/modules/uptime.py

@@ -7,22 +7,22 @@
 """
 from __future__ import annotations
 
-import datetime
+from datetime import datetime, timedelta, timezone
 
 from sopel import plugin
 
 
 def setup(bot):
     if "start_time" not in bot.memory:
-        bot.memory["start_time"] = datetime.datetime.utcnow()
+        bot.memory["start_time"] = datetime.now(timezone.utc)
 
 
 @plugin.command('uptime')
 @plugin.example('.uptime', user_help=True)
 @plugin.output_prefix('[uptime] ')
 def uptime(bot, trigger):
     """Return the uptime of Sopel."""
-    delta = datetime.timedelta(seconds=round((datetime.datetime.utcnow() -
-                                              bot.memory["start_time"])
-                                             .total_seconds()))
+    delta = timedelta(seconds=round((datetime.now(timezone.utc) -
+                                    bot.memory["start_time"])
+                                    .total_seconds()))
     bot.say("I've been sitting here for {} and I keep going!".format(delta))