replaced deprecated datetime.utcnow() with datetime.now(datetime.UTC)

botocore/auth.py

@@ -421,7 +421,7 @@ def signature(self, string_to_sign, request):
     def add_auth(self, request):
         if self.credentials is None:
             raise NoCredentialsError()
-        datetime_now = datetime.datetime.utcnow()
+        datetime_now = datetime.datetime.now(datetime.UTC)
         request.context['timestamp'] = datetime_now.strftime(SIGV4_TIMESTAMP)
         # This could be a retry.  Make sure the previous
         # authorization header is removed first.
@@ -559,7 +559,7 @@ class S3ExpressPostAuth(S3ExpressAuth):
     REQUIRES_IDENTITY_CACHE = True
 
     def add_auth(self, request):
-        datetime_now = datetime.datetime.utcnow()
+        datetime_now = datetime.datetime.now(datetime.UTC)
         request.context['timestamp'] = datetime_now.strftime(SIGV4_TIMESTAMP)
 
         fields = {}
@@ -818,7 +818,7 @@ class S3SigV4PostAuth(SigV4Auth):
     """
 
     def add_auth(self, request):
-        datetime_now = datetime.datetime.utcnow()
+        datetime_now = datetime.datetime.now(datetime.UTC)
         request.context['timestamp'] = datetime_now.strftime(SIGV4_TIMESTAMP)
 
         fields = {}