Replace deprecated utcnow

docs/conf.py

@@ -14,7 +14,7 @@
 
 import os
 import sys
-from datetime import datetime
+from datetime import datetime, timezone
 from pathlib import Path
 
 if sys.version_info < (3, 11):
@@ -68,7 +68,7 @@
 # -- Project information ------------------------------------------------------
 project = project_meta['name']
 author = project_meta['authors'][0]['name']
-copyright = f'2011-{datetime.utcnow().year}, {author}'
+copyright = f'2011-{datetime.now(tz=timezone.utc).year}, {author}'
 
 # The version info for the project you're documenting, acts as
 # replacement for |version| and |release|, also used in various other