tests: Ignore timezone requirement flake8 check

Hypothesis need naive object as min/max limits because it constructs the
end datetime object using a strategy to set timezones.

Signed-off-by: Leandro Lucarella <luca-frequenz@llucax.com>

Author: llucax

tests/proto/test_datetime.py

@@ -15,9 +15,10 @@
 from frequenz.client.common.proto import datetime_from_proto, datetime_to_proto
 
 # Strategy for generating datetime objects
+# It requires naive datetime objects because it creates the timezone via a strategy
 datetime_strategy = st.datetimes(
-    min_value=datetime(1970, 1, 1),
-    max_value=datetime(9999, 12, 31),
+    min_value=datetime(1970, 1, 1),  # noqa: DTZ001
+    max_value=datetime(9999, 12, 31),  # noqa: DTZ001
     timezones=st.just(timezone.utc),
 )