Merge branch 'mr/fix_UP026_rule' into 'master'

Fix UP026 rule

See merge request it/e3-core!335

Author: liaiss

tests/tests_e3/event/main_test.py

@@ -4,7 +4,7 @@
 import json
 from pathlib import Path
 
-import mock
+from unittest import mock
 
 import e3.archive
 import e3.event

tests/tests_e3/net/smtp/main_test.py

@@ -4,7 +4,7 @@
 from email.utils import make_msgid
 from typing import NoReturn
 
-import mock
+from unittest import mock
 import pytest
 
 import e3.net.smtp