Replace deprecated datetime.utcnow usage

Closes #12647

proteus/proteus/pyson.py

@@ -662,7 +662,8 @@ class DateTime(Date):
                 and not isinstance(now, datetime.datetime)):
             now = datetime.datetime.combine(now, datetime.time())
         if not isinstance(now, datetime.datetime):
-            now = datetime.datetime.utcnow()
+            now = datetime.datetime.now(
+                datetime.timezone.utc).replace(tzinfo=None)
         return now + relativedelta(
             year=dct['y'],
             month=dct['M'],

tryton/tryton/common/domain_parser.py

@@ -453,7 +453,7 @@ def complete_value(field, value):
 
     def complete_datetime():
         yield datetime.date.today()
-        yield datetime.datetime.utcnow()
+        yield datetime.datetime.now(datetime.timezone.utc).replace(tzinfo=None)
 
     def complete_date():
         yield datetime.date.today()

tryton/tryton/pyson.py

@@ -712,7 +712,8 @@ class DateTime(Date):
                 and not isinstance(now, datetime.datetime)):
             now = datetime.datetime.combine(now, datetime.time())
         if not isinstance(now, datetime.datetime):
-            now = datetime.datetime.utcnow()
+            now = datetime.datetime.now(
+                datetime.timezone.utc).replace(tzinfo=None)
         return now + relativedelta(
             year=dct['y'],
             month=dct['M'],

trytond/trytond/pyson.py

@@ -712,7 +712,8 @@ class DateTime(Date):
                 and not isinstance(now, datetime.datetime)):
             now = datetime.datetime.combine(now, datetime.time())
         if not isinstance(now, datetime.datetime):
-            now = datetime.datetime.utcnow()
+            now = datetime.datetime.now(
+                datetime.timezone.utc).replace(tzinfo=None)
         return now + relativedelta(
             year=dct['y'],
             month=dct['M'],